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very first article I write","date":"2023-03-18T02:19:41.000Z","_content":"\n```python\nprint(\"Hello World!\")\n```\n\n|语言|内容|\n|:---:|:--|\n|`python`| `PySide`|\n| `R` | `base-R`, `tidyverse`|","source":"_posts/The-very-first-article-I-write.md","raw":"---\ntitle: The very first article I write\ndate: 2023-03-18 10:19:41\ntags:\n---\n\n```python\nprint(\"Hello World!\")\n```\n\n|语言|内容|\n|:---:|:--|\n|`python`| `PySide`|\n| `R` | `base-R`, `tidyverse`|","slug":"The-very-first-article-I-write","published":1,"updated":"2024-09-27T14:00:21.940Z","_id":"clfddn53f0000x8lc681p73qy","comments":1,"layout":"post","photos":[],"link":"","content":"<figure class=\"highlight python\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"built_in\">print</span>(<span class=\"string\">"Hello World!"</span>)</span><br></pre></td></tr></table></figure>\n\n<table>\n<thead>\n<tr>\n<th align=\"center\">语言</th>\n<th align=\"left\">内容</th>\n</tr>\n</thead>\n<tbody><tr>\n<td align=\"center\"><code>python</code></td>\n<td align=\"left\"><code>PySide</code></td>\n</tr>\n<tr>\n<td align=\"center\"><code>R</code></td>\n<td align=\"left\"><code>base-R</code>, <code>tidyverse</code></td>\n</tr>\n</tbody></table>\n","site":{"data":{}},"excerpt":"","more":"<figure class=\"highlight python\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"built_in\">print</span>(<span class=\"string\">"Hello World!"</span>)</span><br></pre></td></tr></table></figure>\n\n<table>\n<thead>\n<tr>\n<th align=\"center\">语言</th>\n<th align=\"left\">内容</th>\n</tr>\n</thead>\n<tbody><tr>\n<td align=\"center\"><code>python</code></td>\n<td align=\"left\"><code>PySide</code></td>\n</tr>\n<tr>\n<td align=\"center\"><code>R</code></td>\n<td align=\"left\"><code>base-R</code>, <code>tidyverse</code></td>\n</tr>\n</tbody></table>\n"},{"title":"PowerShell 或者说 .NET 中的字符串替换","date":"2024-09-27T11:32:18.000Z","_content":"主要参考了 MSDN 官网的[教程](https://learn.microsoft.com/zh-cn/powershell/scripting/learn/deep-dives/everything-about-string-substitutions)\n\n\n## Concatenation 连接\n\n首先即是各个编程语言均支持的语法糖：`+` 作为字符串拼接。\n\n```powershell\n$name = Xiaoming\n$message = \"Hello, \" + $name\n```\n\n## Variable substitutions 变量替换\n\n即直接使用 `$` 或 `$()` 在字符串里引用替换\n\n```powershell\n$first = \"Li\"\n$last = \"Xiaoming\"\n$message = \"Hello, ${first} ${last}\"\n$msg = \"Hello, $first $last\"\n```\n\n## Command substitution 命令替换\n\n```powershell\n❯ $directory = Get-ChildItem -Path C:\\Windows\n❯ $message = \"Time: $($directory.CreationTime)\" # 这里必须使用$()取值\n❯ Write-Output $message\n```\n\n### Command execution 命令执行\n\n```powershell\n❯ \"Date: $(Get-Date)\" # 此处时间的默认格式和 locale 的设置有关\nDate: 09/28/2024 00:00:00\n```\n\n## Format string 格式化字符串\n\n```powershell\n# .NET 字符串格式化\n❯ [string]::Format('Hello, {0} {1}', $first, $last)\n# 或者是 powershell 中的\n❯ 'Hello, {0} {1}' -f $first, $last\n```\n\n### Format values as arrays 将值格式化为数组\n\n```powershell\n# 即一种解包的方式\n$values = @(\n \"Xiaoming\",\n \"Lili\"\n)\n'Hello, {0} {1}.' -f $values\n```\n\n## 高级格式设置\n\n这是来自于 .NET 的方法，也就是 [`String.Format`](https://learn.microsoft.com/zh-cn/dotnet/api/system.string.format) 的方法\n此处参考博客 [一个有故事的devops: powershell字符串操作](https://www.cnblogs.com/zqj-blog/p/10044181.html) \n\n对时间的字符串格式化\n\n```powershell\n❯ '{0:yyyy-MM-dd}' -f (Get-Date)\n2024-09-28\n```\n\n1. 固定列宽\n\n```powershell\n$a = \"name\"\n$b = \"age\"\n$c = \"sex\"\n# 分别指定 0，1，2，对应 $a, $b, $c，然后再指定宽度15左对齐\n$d = \"{0,-15}{1,-15}{2,-15}\" -f $a, $b, $c \nWrite-Output $d # 输出 $d\n```\n\n2. 将数字转换成百分数\n\n```powershell\n\"{0:p}\" -f 3.14159 # 默认转换是两位\n\n\"{0:p5}\" -f 3.1415926 # 也可以指定位数\n```\n\n3. 保留 n 位小数\n\n```powershell\n\"{0:n0}\" -f 3.14 # 3\n\"{0:n3}\" - f 3.14159 # 3.141\n```\n\n4. 字符串替换\n\n常用的格式化的数值表格\n\n\n|字符| 示例 | 说明 |\n| :--:|:-- |:-- |\n|`e` | `>\"{0:e2}\" -f 2000` <br>`2.00e+003` |**e**xponent 科学计数法 |\n| `d` | `>\"{0:d}\" -f 2000` <br>`2000` | **d**ecimal 整数 |\n| `f` | `>\"{0:f2}\" -f 2000` |**f**ixed point 小数点后指定位数 | \n| `g` | `>\"{0:g}\" -f 2000` <br>`2000` | **g**eneral 小数点后最多一位，整数则不显示小数点 |\n| `n` | `>\"{0:n}\" -f 2000` <br>`2,000` |**n**umber 默认小数点后两位，整数则不显示小数点 | \n| `c` | `>\"{0:c}\" -f 2000` <br>`¥ 2,000.00`| **c**urrency 货币格式，小数点后两位，整数则不显示小数点 | \n| `p` | `>\"{0:p}\" -f 0.98765` <br>`98.76%` | **p**ercent 百分数，小数点后两位，整数则不显示小数点 |\n| `x` | `>\"{0:x}\" -f 2000` <br>`7d0` | he**x**adecimal 十六进制|\n\n5. 字符串包含\n\n```powershell\n❯ \"I have a dream\".Contains(\"have\")\nTrue\n\n❯ \"I have a dream\".Contains(\"i\")\nFalse\n\n❯ \"I have a dream\" -match \"i\"\nTrue\n\n❯ \"I have a dream\" -cmatch \"i\"\nFalse\n```\n\n`字符串.Contains`、`-cmath` 区分大小写，而 `-match` 忽略大小写\n\n### 联接字符串\n\n使用 `-join` 连接字符串\n\n```powershell\n❯ $server = @(\n∙ 'server1',\n∙ 'server2',\n∙ 'server3'\n∙ )\n❯ $server -join ','\nserver1,server2,server3\n```\n\n### `Join-Path`\n\n`Join-Path` 是 PowerShell 中的一个内置函数，用于将多个路径元素组合成一个完整的路径。`\n\n```powershell\n❯ $folder = \"Temp\"\n❯ Join-Path -Path 'C:\\Windows' -ChildPath $folder\nC:\\Windows\\Temp\n```\n\n## StringBuilder\n\n`StringBuilder` 是 .NET Framework 中的一个类，用于在运行时动态地创建和修改字符串。它提供了一种更高效的方式来拼接字符串，因为它不会在每次拼接时都创建一个新的字符串对象，而是将拼接后的字符串追加到`StringBuilder`对象中。\n\n```powershell\n$stringBuilder = New-Object -TypeName \"System.Text.StringBuilder\"\n\n[void]$stringBuilder.Append(\"Numbers: \")\nforeach($number in 1..10000)\n{\n [void]$stringBuilder.Append(\" $number\")\n}\n$message = $stringBuilder.ToString()\n```\n\n## 带大括号的描述符\n\n`${<var names>}` 这样的调用方式能更好的明确边界\n\n```powershell\nWrite-Host \"$test $tester $($test)ter\"\nWrite-Host \"{0} {1} {0}ter\" -f $test, $tester\n```\n","source":"_posts/Powershell的字符串的格式化.md","raw":"---\ntitle: PowerShell 或者说 .NET 中的字符串替换\ndate: 2024-09-27 19:32:18\ntags:\n---\n主要参考了 MSDN 官网的[教程](https://learn.microsoft.com/zh-cn/powershell/scripting/learn/deep-dives/everything-about-string-substitutions)\n\n\n## Concatenation 连接\n\n首先即是各个编程语言均支持的语法糖：`+` 作为字符串拼接。\n\n```powershell\n$name = Xiaoming\n$message = \"Hello, \" + $name\n```\n\n## Variable substitutions 变量替换\n\n即直接使用 `$` 或 `$()` 在字符串里引用替换\n\n```powershell\n$first = \"Li\"\n$last = \"Xiaoming\"\n$message = \"Hello, ${first} ${last}\"\n$msg = \"Hello, $first $last\"\n```\n\n## Command substitution 命令替换\n\n```powershell\n❯ $directory = Get-ChildItem -Path C:\\Windows\n❯ $message = \"Time: $($directory.CreationTime)\" # 这里必须使用$()取值\n❯ Write-Output $message\n```\n\n### Command execution 命令执行\n\n```powershell\n❯ \"Date: $(Get-Date)\" # 此处时间的默认格式和 locale 的设置有关\nDate: 09/28/2024 00:00:00\n```\n\n## Format string 格式化字符串\n\n```powershell\n# .NET 字符串格式化\n❯ [string]::Format('Hello, {0} {1}', $first, $last)\n# 或者是 powershell 中的\n❯ 'Hello, {0} {1}' -f $first, $last\n```\n\n### Format values as arrays 将值格式化为数组\n\n```powershell\n# 即一种解包的方式\n$values = @(\n \"Xiaoming\",\n \"Lili\"\n)\n'Hello, {0} {1}.' -f $values\n```\n\n## 高级格式设置\n\n这是来自于 .NET 的方法，也就是 [`String.Format`](https://learn.microsoft.com/zh-cn/dotnet/api/system.string.format) 的方法\n此处参考博客 [一个有故事的devops: powershell字符串操作](https://www.cnblogs.com/zqj-blog/p/10044181.html) \n\n对时间的字符串格式化\n\n```powershell\n❯ '{0:yyyy-MM-dd}' -f (Get-Date)\n2024-09-28\n```\n\n1. 固定列宽\n\n```powershell\n$a = \"name\"\n$b = \"age\"\n$c = \"sex\"\n# 分别指定 0，1，2，对应 $a, $b, $c，然后再指定宽度15左对齐\n$d = \"{0,-15}{1,-15}{2,-15}\" -f $a, $b, $c \nWrite-Output $d # 输出 $d\n```\n\n2. 将数字转换成百分数\n\n```powershell\n\"{0:p}\" -f 3.14159 # 默认转换是两位\n\n\"{0:p5}\" -f 3.1415926 # 也可以指定位数\n```\n\n3. 保留 n 位小数\n\n```powershell\n\"{0:n0}\" -f 3.14 # 3\n\"{0:n3}\" - f 3.14159 # 3.141\n```\n\n4. 字符串替换\n\n常用的格式化的数值表格\n\n\n|字符| 示例 | 说明 |\n| :--:|:-- |:-- |\n|`e` | `>\"{0:e2}\" -f 2000` <br>`2.00e+003` |**e**xponent 科学计数法 |\n| `d` | `>\"{0:d}\" -f 2000` <br>`2000` | **d**ecimal 整数 |\n| `f` | `>\"{0:f2}\" -f 2000` |**f**ixed point 小数点后指定位数 | \n| `g` | `>\"{0:g}\" -f 2000` <br>`2000` | **g**eneral 小数点后最多一位，整数则不显示小数点 |\n| `n` | `>\"{0:n}\" -f 2000` <br>`2,000` |**n**umber 默认小数点后两位，整数则不显示小数点 | \n| `c` | `>\"{0:c}\" -f 2000` <br>`¥ 2,000.00`| **c**urrency 货币格式，小数点后两位，整数则不显示小数点 | \n| `p` | `>\"{0:p}\" -f 0.98765` <br>`98.76%` | **p**ercent 百分数，小数点后两位，整数则不显示小数点 |\n| `x` | `>\"{0:x}\" -f 2000` <br>`7d0` | he**x**adecimal 十六进制|\n\n5. 字符串包含\n\n```powershell\n❯ \"I have a dream\".Contains(\"have\")\nTrue\n\n❯ \"I have a dream\".Contains(\"i\")\nFalse\n\n❯ \"I have a dream\" -match \"i\"\nTrue\n\n❯ \"I have a dream\" -cmatch \"i\"\nFalse\n```\n\n`字符串.Contains`、`-cmath` 区分大小写，而 `-match` 忽略大小写\n\n### 联接字符串\n\n使用 `-join` 连接字符串\n\n```powershell\n❯ $server = @(\n∙ 'server1',\n∙ 'server2',\n∙ 'server3'\n∙ )\n❯ $server -join ','\nserver1,server2,server3\n```\n\n### `Join-Path`\n\n`Join-Path` 是 PowerShell 中的一个内置函数，用于将多个路径元素组合成一个完整的路径。`\n\n```powershell\n❯ $folder = \"Temp\"\n❯ Join-Path -Path 'C:\\Windows' -ChildPath $folder\nC:\\Windows\\Temp\n```\n\n## StringBuilder\n\n`StringBuilder` 是 .NET Framework 中的一个类，用于在运行时动态地创建和修改字符串。它提供了一种更高效的方式来拼接字符串，因为它不会在每次拼接时都创建一个新的字符串对象，而是将拼接后的字符串追加到`StringBuilder`对象中。\n\n```powershell\n$stringBuilder = New-Object -TypeName \"System.Text.StringBuilder\"\n\n[void]$stringBuilder.Append(\"Numbers: \")\nforeach($number in 1..10000)\n{\n [void]$stringBuilder.Append(\" $number\")\n}\n$message = $stringBuilder.ToString()\n```\n\n## 带大括号的描述符\n\n`${<var names>}` 这样的调用方式能更好的明确边界\n\n```powershell\nWrite-Host \"$test $tester $($test)ter\"\nWrite-Host \"{0} {1} {0}ter\" -f $test, $tester\n```\n","slug":"Powershell的字符串的格式化","published":1,"updated":"2024-09-27T19:06:14.168Z","_id":"cm1kotvul0002o8j43v5605js","comments":1,"layout":"post","photos":[],"link":"","content":"<p>主要参考了 MSDN 官网的<a href=\"https://learn.microsoft.com/zh-cn/powershell/scripting/learn/deep-dives/everything-about-string-substitutions\">教程</a></p>\n<h2 id=\"Concatenation-连接\"><a href=\"#Concatenation-连接\" class=\"headerlink\" title=\"Concatenation 连接\"></a>Concatenation 连接</h2><p>首先即是各个编程语言均支持的语法糖：<code>+</code> 作为字符串拼接。</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"variable\">$name</span> = Xiaoming</span><br><span class=\"line\"><span class=\"variable\">$message</span> = <span class=\"string\">"Hello, "</span> + <span class=\"variable\">$name</span></span><br></pre></td></tr></table></figure>\n\n<h2 id=\"Variable-substitutions-变量替换\"><a href=\"#Variable-substitutions-变量替换\" class=\"headerlink\" title=\"Variable substitutions 变量替换\"></a>Variable substitutions 变量替换</h2><p>即直接使用 <code>$</code> 或 <code>$()</code> 在字符串里引用替换</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"variable\">$first</span> = <span class=\"string\">"Li"</span></span><br><span class=\"line\"><span class=\"variable\">$last</span> = <span class=\"string\">"Xiaoming"</span></span><br><span class=\"line\"><span class=\"variable\">$message</span> = <span class=\"string\">"Hello, <span class=\"variable\">$</span>{first} <span class=\"variable\">$</span>{last}"</span></span><br><span class=\"line\"><span class=\"variable\">$msg</span> = <span class=\"string\">"Hello, <span class=\"variable\">$first</span> <span class=\"variable\">$last</span>"</span></span><br></pre></td></tr></table></figure>\n\n<h2 id=\"Command-substitution-命令替换\"><a href=\"#Command-substitution-命令替换\" class=\"headerlink\" title=\"Command substitution 命令替换\"></a>Command substitution 命令替换</h2><figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"variable\">$directory</span> = <span class=\"built_in\">Get-ChildItem</span> <span class=\"literal\">-Path</span> C:\\Windows</span><br><span class=\"line\">❯ <span class=\"variable\">$message</span> = <span class=\"string\">"Time: <span class=\"variable\">$</span>(<span class=\"variable\">$directory</span>.CreationTime)"</span> <span class=\"comment\"># 这里必须使用$()取值</span></span><br><span class=\"line\">❯ <span class=\"built_in\">Write-Output</span> <span class=\"variable\">$message</span></span><br></pre></td></tr></table></figure>\n\n<h3 id=\"Command-execution-命令执行\"><a href=\"#Command-execution-命令执行\" class=\"headerlink\" title=\"Command execution 命令执行\"></a>Command execution 命令执行</h3><figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"string\">"Date: <span class=\"variable\">$</span>(Get-Date)"</span> <span class=\"comment\"># 此处时间的默认格式和 locale 的设置有关</span></span><br><span class=\"line\">Date: <span class=\"number\">09</span>/<span class=\"number\">28</span>/<span class=\"number\">2024</span> <span class=\"number\">00</span>:<span class=\"number\">00</span>:<span class=\"number\">00</span></span><br></pre></td></tr></table></figure>\n\n<h2 id=\"Format-string-格式化字符串\"><a href=\"#Format-string-格式化字符串\" class=\"headerlink\" title=\"Format string 格式化字符串\"></a>Format string 格式化字符串</h2><figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"comment\"># .NET 字符串格式化</span></span><br><span class=\"line\">❯ [<span class=\"built_in\">string</span>]::Format(<span class=\"string\">'Hello, {0} {1}'</span>, <span class=\"variable\">$first</span>, <span class=\"variable\">$last</span>)</span><br><span class=\"line\"><span class=\"comment\"># 或者是 powershell 中的</span></span><br><span class=\"line\">❯ <span class=\"string\">'Hello, {0} {1}'</span> <span class=\"operator\">-f</span> <span class=\"variable\">$first</span>, <span class=\"variable\">$last</span></span><br></pre></td></tr></table></figure>\n\n<h3 id=\"Format-values-as-arrays-将值格式化为数组\"><a href=\"#Format-values-as-arrays-将值格式化为数组\" class=\"headerlink\" title=\"Format values as arrays 将值格式化为数组\"></a>Format values as arrays 将值格式化为数组</h3><figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br><span class=\"line\">5</span><br><span class=\"line\">6</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"comment\"># 即一种解包的方式</span></span><br><span class=\"line\"><span class=\"variable\">$values</span> = <span class=\"selector-tag\">@</span>(</span><br><span class=\"line\"> <span class=\"string\">"Xiaoming"</span>,</span><br><span class=\"line\"> <span class=\"string\">"Lili"</span></span><br><span class=\"line\">)</span><br><span class=\"line\"><span class=\"string\">'Hello, {0} {1}.'</span> <span class=\"operator\">-f</span> <span class=\"variable\">$values</span></span><br></pre></td></tr></table></figure>\n\n<h2 id=\"高级格式设置\"><a href=\"#高级格式设置\" class=\"headerlink\" title=\"高级格式设置\"></a>高级格式设置</h2><p>这是来自于 .NET 的方法，也就是 <a href=\"https://learn.microsoft.com/zh-cn/dotnet/api/system.string.format\"><code>String.Format</code></a> 的方法<br>此处参考博客 <a href=\"https://www.cnblogs.com/zqj-blog/p/10044181.html\">一个有故事的devops: powershell字符串操作</a> </p>\n<p>对时间的字符串格式化</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"string\">'{0:yyyy-MM-dd}'</span> <span class=\"operator\">-f</span> (<span class=\"built_in\">Get-Date</span>)</span><br><span class=\"line\"><span class=\"number\">2024</span><span class=\"literal\">-09-28</span></span><br></pre></td></tr></table></figure>\n\n<ol>\n<li>固定列宽</li>\n</ol>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br><span class=\"line\">5</span><br><span class=\"line\">6</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"variable\">$a</span> = <span class=\"string\">"name"</span></span><br><span class=\"line\"><span class=\"variable\">$b</span> = <span class=\"string\">"age"</span></span><br><span class=\"line\"><span class=\"variable\">$c</span> = <span class=\"string\">"sex"</span></span><br><span class=\"line\"><span class=\"comment\"># 分别指定 0，1，2，对应 $a, $b, $c，然后再指定宽度15左对齐</span></span><br><span class=\"line\"><span class=\"variable\">$d</span> = <span class=\"string\">"{0,-15}{1,-15}{2,-15}"</span> <span class=\"operator\">-f</span> <span class=\"variable\">$a</span>, <span class=\"variable\">$b</span>, <span class=\"variable\">$c</span> </span><br><span class=\"line\"><span class=\"built_in\">Write-Output</span> <span class=\"variable\">$d</span> <span class=\"comment\"># 输出 $d</span></span><br></pre></td></tr></table></figure>\n\n<ol start=\"2\">\n<li>将数字转换成百分数</li>\n</ol>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"string\">"{0:p}"</span> <span class=\"operator\">-f</span> <span class=\"number\">3.14159</span> <span class=\"comment\"># 默认转换是两位</span></span><br><span class=\"line\"></span><br><span class=\"line\"><span class=\"string\">"{0:p5}"</span> <span class=\"operator\">-f</span> <span class=\"number\">3.1415926</span> <span class=\"comment\"># 也可以指定位数</span></span><br></pre></td></tr></table></figure>\n\n<ol start=\"3\">\n<li>保留 n 位小数</li>\n</ol>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"string\">"{0:n0}"</span> <span class=\"operator\">-f</span> <span class=\"number\">3.14</span> <span class=\"comment\"># 3</span></span><br><span class=\"line\"><span class=\"string\">"{0:n3}"</span> - f <span class=\"number\">3.14159</span> <span class=\"comment\"># 3.141</span></span><br></pre></td></tr></table></figure>\n\n<ol start=\"4\">\n<li>字符串替换</li>\n</ol>\n<p>常用的格式化的数值表格</p>\n<table>\n<thead>\n<tr>\n<th align=\"center\">字符</th>\n<th align=\"left\">示例</th>\n<th align=\"left\">说明</th>\n</tr>\n</thead>\n<tbody><tr>\n<td align=\"center\"><code>e</code></td>\n<td align=\"left\"><code>>"{0:e2}" -f 2000</code> <br><code>2.00e+003</code></td>\n<td align=\"left\"><strong>e</strong>xponent 科学计数法</td>\n</tr>\n<tr>\n<td align=\"center\"><code>d</code></td>\n<td align=\"left\"><code>>"{0:d}" -f 2000</code> <br><code>2000</code></td>\n<td align=\"left\"><strong>d</strong>ecimal 整数</td>\n</tr>\n<tr>\n<td align=\"center\"><code>f</code></td>\n<td align=\"left\"><code>>"{0:f2}" -f 2000</code></td>\n<td align=\"left\"><strong>f</strong>ixed point 小数点后指定位数</td>\n</tr>\n<tr>\n<td align=\"center\"><code>g</code></td>\n<td align=\"left\"><code>>"{0:g}" -f 2000</code> <br><code>2000</code></td>\n<td align=\"left\"><strong>g</strong>eneral 小数点后最多一位，整数则不显示小数点</td>\n</tr>\n<tr>\n<td align=\"center\"><code>n</code></td>\n<td align=\"left\"><code>>"{0:n}" -f 2000</code> <br><code>2,000</code></td>\n<td align=\"left\"><strong>n</strong>umber 默认小数点后两位，整数则不显示小数点</td>\n</tr>\n<tr>\n<td align=\"center\"><code>c</code></td>\n<td align=\"left\"><code>>"{0:c}" -f 2000</code> <br><code>¥ 2,000.00</code></td>\n<td align=\"left\"><strong>c</strong>urrency 货币格式，小数点后两位，整数则不显示小数点</td>\n</tr>\n<tr>\n<td align=\"center\"><code>p</code></td>\n<td align=\"left\"><code>>"{0:p}" -f 0.98765</code> <br><code>98.76%</code></td>\n<td align=\"left\"><strong>p</strong>ercent 百分数，小数点后两位，整数则不显示小数点</td>\n</tr>\n<tr>\n<td align=\"center\"><code>x</code></td>\n<td align=\"left\"><code>>"{0:x}" -f 2000</code> <br><code>7d0</code></td>\n<td align=\"left\">he<strong>x</strong>adecimal 十六进制</td>\n</tr>\n</tbody></table>\n<ol start=\"5\">\n<li>字符串包含</li>\n</ol>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br><span class=\"line\">5</span><br><span class=\"line\">6</span><br><span class=\"line\">7</span><br><span class=\"line\">8</span><br><span class=\"line\">9</span><br><span class=\"line\">10</span><br><span class=\"line\">11</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"string\">"I have a dream"</span>.Contains(<span class=\"string\">"have"</span>)</span><br><span class=\"line\">True</span><br><span class=\"line\"></span><br><span class=\"line\">❯ <span class=\"string\">"I have a dream"</span>.Contains(<span class=\"string\">"i"</span>)</span><br><span class=\"line\">False</span><br><span class=\"line\"></span><br><span class=\"line\">❯ <span class=\"string\">"I have a dream"</span> <span class=\"operator\">-match</span> <span class=\"string\">"i"</span></span><br><span class=\"line\">True</span><br><span class=\"line\"></span><br><span class=\"line\">❯ <span class=\"string\">"I have a dream"</span> <span class=\"operator\">-cmatch</span> <span class=\"string\">"i"</span></span><br><span class=\"line\">False</span><br></pre></td></tr></table></figure>\n\n<p><code>字符串.Contains</code>、<code>-cmath</code> 区分大小写，而 <code>-match</code> 忽略大小写</p>\n<h3 id=\"联接字符串\"><a href=\"#联接字符串\" class=\"headerlink\" title=\"联接字符串\"></a>联接字符串</h3><p>使用 <code>-join</code> 连接字符串</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br><span class=\"line\">5</span><br><span class=\"line\">6</span><br><span class=\"line\">7</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"variable\">$server</span> = <span class=\"selector-tag\">@</span>(</span><br><span class=\"line\">∙ <span class=\"string\">'server1'</span>,</span><br><span class=\"line\">∙ <span class=\"string\">'server2'</span>,</span><br><span class=\"line\">∙ <span class=\"string\">'server3'</span></span><br><span class=\"line\">∙ )</span><br><span class=\"line\">❯ <span class=\"variable\">$server</span> <span class=\"operator\">-join</span> <span class=\"string\">','</span></span><br><span class=\"line\">server1,server2,server3</span><br></pre></td></tr></table></figure>\n\n<h3 id=\"Join-Path\"><a href=\"#Join-Path\" class=\"headerlink\" title=\"Join-Path\"></a><code>Join-Path</code></h3><p><code>Join-Path</code> 是 PowerShell 中的一个内置函数，用于将多个路径元素组合成一个完整的路径。`</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"variable\">$folder</span> = <span class=\"string\">"Temp"</span></span><br><span class=\"line\">❯ <span class=\"built_in\">Join-Path</span> <span class=\"literal\">-Path</span> <span class=\"string\">'C:\\Windows'</span> <span class=\"literal\">-ChildPath</span> <span class=\"variable\">$folder</span></span><br><span class=\"line\">C:\\Windows\\Temp</span><br></pre></td></tr></table></figure>\n\n<h2 id=\"StringBuilder\"><a href=\"#StringBuilder\" class=\"headerlink\" title=\"StringBuilder\"></a>StringBuilder</h2><p><code>StringBuilder</code> 是 .NET Framework 中的一个类，用于在运行时动态地创建和修改字符串。它提供了一种更高效的方式来拼接字符串，因为它不会在每次拼接时都创建一个新的字符串对象，而是将拼接后的字符串追加到<code>StringBuilder</code>对象中。</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br><span class=\"line\">5</span><br><span class=\"line\">6</span><br><span class=\"line\">7</span><br><span class=\"line\">8</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"variable\">$stringBuilder</span> = <span class=\"built_in\">New-Object</span> <span class=\"literal\">-TypeName</span> <span class=\"string\">"System.Text.StringBuilder"</span></span><br><span class=\"line\"></span><br><span class=\"line\">[<span class=\"built_in\">void</span>]<span class=\"variable\">$stringBuilder</span>.Append(<span class=\"string\">"Numbers: "</span>)</span><br><span class=\"line\"><span class=\"keyword\">foreach</span>(<span class=\"variable\">$number</span> <span class=\"keyword\">in</span> <span class=\"number\">1</span>..<span class=\"number\">10000</span>)</span><br><span class=\"line\">{</span><br><span class=\"line\"> [<span class=\"built_in\">void</span>]<span class=\"variable\">$stringBuilder</span>.Append(<span class=\"string\">" <span class=\"variable\">$number</span>"</span>)</span><br><span class=\"line\">}</span><br><span class=\"line\"><span class=\"variable\">$message</span> = <span class=\"variable\">$stringBuilder</span>.ToString()</span><br></pre></td></tr></table></figure>\n\n<h2 id=\"带大括号的描述符\"><a href=\"#带大括号的描述符\" class=\"headerlink\" title=\"带大括号的描述符\"></a>带大括号的描述符</h2><p><code>${<var names>}</code> 这样的调用方式能更好的明确边界</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"built_in\">Write-Host</span> <span class=\"string\">"<span class=\"variable\">$test</span> <span class=\"variable\">$tester</span> <span class=\"variable\">$</span>(<span class=\"variable\">$test</span>)ter"</span></span><br><span class=\"line\"><span class=\"built_in\">Write-Host</span> <span class=\"string\">"{0} {1} {0}ter"</span> <span class=\"operator\">-f</span> <span class=\"variable\">$test</span>, <span class=\"variable\">$tester</span></span><br></pre></td></tr></table></figure>\n","site":{"data":{}},"excerpt":"","more":"<p>主要参考了 MSDN 官网的<a href=\"https://learn.microsoft.com/zh-cn/powershell/scripting/learn/deep-dives/everything-about-string-substitutions\">教程</a></p>\n<h2 id=\"Concatenation-连接\"><a href=\"#Concatenation-连接\" class=\"headerlink\" title=\"Concatenation 连接\"></a>Concatenation 连接</h2><p>首先即是各个编程语言均支持的语法糖：<code>+</code> 作为字符串拼接。</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"variable\">$name</span> = Xiaoming</span><br><span class=\"line\"><span class=\"variable\">$message</span> = <span class=\"string\">"Hello, "</span> + <span class=\"variable\">$name</span></span><br></pre></td></tr></table></figure>\n\n<h2 id=\"Variable-substitutions-变量替换\"><a href=\"#Variable-substitutions-变量替换\" class=\"headerlink\" title=\"Variable substitutions 变量替换\"></a>Variable substitutions 变量替换</h2><p>即直接使用 <code>$</code> 或 <code>$()</code> 在字符串里引用替换</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"variable\">$first</span> = <span class=\"string\">"Li"</span></span><br><span class=\"line\"><span class=\"variable\">$last</span> = <span class=\"string\">"Xiaoming"</span></span><br><span class=\"line\"><span class=\"variable\">$message</span> = <span class=\"string\">"Hello, <span class=\"variable\">$</span>{first} <span class=\"variable\">$</span>{last}"</span></span><br><span class=\"line\"><span class=\"variable\">$msg</span> = <span class=\"string\">"Hello, <span class=\"variable\">$first</span> <span class=\"variable\">$last</span>"</span></span><br></pre></td></tr></table></figure>\n\n<h2 id=\"Command-substitution-命令替换\"><a href=\"#Command-substitution-命令替换\" class=\"headerlink\" title=\"Command substitution 命令替换\"></a>Command substitution 命令替换</h2><figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"variable\">$directory</span> = <span class=\"built_in\">Get-ChildItem</span> <span class=\"literal\">-Path</span> C:\\Windows</span><br><span class=\"line\">❯ <span class=\"variable\">$message</span> = <span class=\"string\">"Time: <span class=\"variable\">$</span>(<span class=\"variable\">$directory</span>.CreationTime)"</span> <span class=\"comment\"># 这里必须使用$()取值</span></span><br><span class=\"line\">❯ <span class=\"built_in\">Write-Output</span> <span class=\"variable\">$message</span></span><br></pre></td></tr></table></figure>\n\n<h3 id=\"Command-execution-命令执行\"><a href=\"#Command-execution-命令执行\" class=\"headerlink\" title=\"Command execution 命令执行\"></a>Command execution 命令执行</h3><figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"string\">"Date: <span class=\"variable\">$</span>(Get-Date)"</span> <span class=\"comment\"># 此处时间的默认格式和 locale 的设置有关</span></span><br><span class=\"line\">Date: <span class=\"number\">09</span>/<span class=\"number\">28</span>/<span class=\"number\">2024</span> <span class=\"number\">00</span>:<span class=\"number\">00</span>:<span class=\"number\">00</span></span><br></pre></td></tr></table></figure>\n\n<h2 id=\"Format-string-格式化字符串\"><a href=\"#Format-string-格式化字符串\" class=\"headerlink\" title=\"Format string 格式化字符串\"></a>Format string 格式化字符串</h2><figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"comment\"># .NET 字符串格式化</span></span><br><span class=\"line\">❯ [<span class=\"built_in\">string</span>]::Format(<span class=\"string\">'Hello, {0} {1}'</span>, <span class=\"variable\">$first</span>, <span class=\"variable\">$last</span>)</span><br><span class=\"line\"><span class=\"comment\"># 或者是 powershell 中的</span></span><br><span class=\"line\">❯ <span class=\"string\">'Hello, {0} {1}'</span> <span class=\"operator\">-f</span> <span class=\"variable\">$first</span>, <span class=\"variable\">$last</span></span><br></pre></td></tr></table></figure>\n\n<h3 id=\"Format-values-as-arrays-将值格式化为数组\"><a href=\"#Format-values-as-arrays-将值格式化为数组\" class=\"headerlink\" title=\"Format values as arrays 将值格式化为数组\"></a>Format values as arrays 将值格式化为数组</h3><figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br><span class=\"line\">5</span><br><span class=\"line\">6</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"comment\"># 即一种解包的方式</span></span><br><span class=\"line\"><span class=\"variable\">$values</span> = <span class=\"selector-tag\">@</span>(</span><br><span class=\"line\"> <span class=\"string\">"Xiaoming"</span>,</span><br><span class=\"line\"> <span class=\"string\">"Lili"</span></span><br><span class=\"line\">)</span><br><span class=\"line\"><span class=\"string\">'Hello, {0} {1}.'</span> <span class=\"operator\">-f</span> <span class=\"variable\">$values</span></span><br></pre></td></tr></table></figure>\n\n<h2 id=\"高级格式设置\"><a href=\"#高级格式设置\" class=\"headerlink\" title=\"高级格式设置\"></a>高级格式设置</h2><p>这是来自于 .NET 的方法，也就是 <a href=\"https://learn.microsoft.com/zh-cn/dotnet/api/system.string.format\"><code>String.Format</code></a> 的方法<br>此处参考博客 <a href=\"https://www.cnblogs.com/zqj-blog/p/10044181.html\">一个有故事的devops: powershell字符串操作</a> </p>\n<p>对时间的字符串格式化</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"string\">'{0:yyyy-MM-dd}'</span> <span class=\"operator\">-f</span> (<span class=\"built_in\">Get-Date</span>)</span><br><span class=\"line\"><span class=\"number\">2024</span><span class=\"literal\">-09-28</span></span><br></pre></td></tr></table></figure>\n\n<ol>\n<li>固定列宽</li>\n</ol>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br><span class=\"line\">5</span><br><span class=\"line\">6</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"variable\">$a</span> = <span class=\"string\">"name"</span></span><br><span class=\"line\"><span class=\"variable\">$b</span> = <span class=\"string\">"age"</span></span><br><span class=\"line\"><span class=\"variable\">$c</span> = <span class=\"string\">"sex"</span></span><br><span class=\"line\"><span class=\"comment\"># 分别指定 0，1，2，对应 $a, $b, $c，然后再指定宽度15左对齐</span></span><br><span class=\"line\"><span class=\"variable\">$d</span> = <span class=\"string\">"{0,-15}{1,-15}{2,-15}"</span> <span class=\"operator\">-f</span> <span class=\"variable\">$a</span>, <span class=\"variable\">$b</span>, <span class=\"variable\">$c</span> </span><br><span class=\"line\"><span class=\"built_in\">Write-Output</span> <span class=\"variable\">$d</span> <span class=\"comment\"># 输出 $d</span></span><br></pre></td></tr></table></figure>\n\n<ol start=\"2\">\n<li>将数字转换成百分数</li>\n</ol>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"string\">"{0:p}"</span> <span class=\"operator\">-f</span> <span class=\"number\">3.14159</span> <span class=\"comment\"># 默认转换是两位</span></span><br><span class=\"line\"></span><br><span class=\"line\"><span class=\"string\">"{0:p5}"</span> <span class=\"operator\">-f</span> <span class=\"number\">3.1415926</span> <span class=\"comment\"># 也可以指定位数</span></span><br></pre></td></tr></table></figure>\n\n<ol start=\"3\">\n<li>保留 n 位小数</li>\n</ol>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"string\">"{0:n0}"</span> <span class=\"operator\">-f</span> <span class=\"number\">3.14</span> <span class=\"comment\"># 3</span></span><br><span class=\"line\"><span class=\"string\">"{0:n3}"</span> - f <span class=\"number\">3.14159</span> <span class=\"comment\"># 3.141</span></span><br></pre></td></tr></table></figure>\n\n<ol start=\"4\">\n<li>字符串替换</li>\n</ol>\n<p>常用的格式化的数值表格</p>\n<table>\n<thead>\n<tr>\n<th align=\"center\">字符</th>\n<th align=\"left\">示例</th>\n<th align=\"left\">说明</th>\n</tr>\n</thead>\n<tbody><tr>\n<td align=\"center\"><code>e</code></td>\n<td align=\"left\"><code>>"{0:e2}" -f 2000</code> <br><code>2.00e+003</code></td>\n<td align=\"left\"><strong>e</strong>xponent 科学计数法</td>\n</tr>\n<tr>\n<td align=\"center\"><code>d</code></td>\n<td align=\"left\"><code>>"{0:d}" -f 2000</code> <br><code>2000</code></td>\n<td align=\"left\"><strong>d</strong>ecimal 整数</td>\n</tr>\n<tr>\n<td align=\"center\"><code>f</code></td>\n<td align=\"left\"><code>>"{0:f2}" -f 2000</code></td>\n<td align=\"left\"><strong>f</strong>ixed point 小数点后指定位数</td>\n</tr>\n<tr>\n<td align=\"center\"><code>g</code></td>\n<td align=\"left\"><code>>"{0:g}" -f 2000</code> <br><code>2000</code></td>\n<td align=\"left\"><strong>g</strong>eneral 小数点后最多一位，整数则不显示小数点</td>\n</tr>\n<tr>\n<td align=\"center\"><code>n</code></td>\n<td align=\"left\"><code>>"{0:n}" -f 2000</code> <br><code>2,000</code></td>\n<td align=\"left\"><strong>n</strong>umber 默认小数点后两位，整数则不显示小数点</td>\n</tr>\n<tr>\n<td align=\"center\"><code>c</code></td>\n<td align=\"left\"><code>>"{0:c}" -f 2000</code> <br><code>¥ 2,000.00</code></td>\n<td align=\"left\"><strong>c</strong>urrency 货币格式，小数点后两位，整数则不显示小数点</td>\n</tr>\n<tr>\n<td align=\"center\"><code>p</code></td>\n<td align=\"left\"><code>>"{0:p}" -f 0.98765</code> <br><code>98.76%</code></td>\n<td align=\"left\"><strong>p</strong>ercent 百分数，小数点后两位，整数则不显示小数点</td>\n</tr>\n<tr>\n<td align=\"center\"><code>x</code></td>\n<td align=\"left\"><code>>"{0:x}" -f 2000</code> <br><code>7d0</code></td>\n<td align=\"left\">he<strong>x</strong>adecimal 十六进制</td>\n</tr>\n</tbody></table>\n<ol start=\"5\">\n<li>字符串包含</li>\n</ol>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br><span class=\"line\">5</span><br><span class=\"line\">6</span><br><span class=\"line\">7</span><br><span class=\"line\">8</span><br><span class=\"line\">9</span><br><span class=\"line\">10</span><br><span class=\"line\">11</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"string\">"I have a dream"</span>.Contains(<span class=\"string\">"have"</span>)</span><br><span class=\"line\">True</span><br><span class=\"line\"></span><br><span class=\"line\">❯ <span class=\"string\">"I have a dream"</span>.Contains(<span class=\"string\">"i"</span>)</span><br><span class=\"line\">False</span><br><span class=\"line\"></span><br><span class=\"line\">❯ <span class=\"string\">"I have a dream"</span> <span class=\"operator\">-match</span> <span class=\"string\">"i"</span></span><br><span class=\"line\">True</span><br><span class=\"line\"></span><br><span class=\"line\">❯ <span class=\"string\">"I have a dream"</span> <span class=\"operator\">-cmatch</span> <span class=\"string\">"i"</span></span><br><span class=\"line\">False</span><br></pre></td></tr></table></figure>\n\n<p><code>字符串.Contains</code>、<code>-cmath</code> 区分大小写，而 <code>-match</code> 忽略大小写</p>\n<h3 id=\"联接字符串\"><a href=\"#联接字符串\" class=\"headerlink\" title=\"联接字符串\"></a>联接字符串</h3><p>使用 <code>-join</code> 连接字符串</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br><span class=\"line\">5</span><br><span class=\"line\">6</span><br><span class=\"line\">7</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"variable\">$server</span> = <span class=\"selector-tag\">@</span>(</span><br><span class=\"line\">∙ <span class=\"string\">'server1'</span>,</span><br><span class=\"line\">∙ <span class=\"string\">'server2'</span>,</span><br><span class=\"line\">∙ <span class=\"string\">'server3'</span></span><br><span class=\"line\">∙ )</span><br><span class=\"line\">❯ <span class=\"variable\">$server</span> <span class=\"operator\">-join</span> <span class=\"string\">','</span></span><br><span class=\"line\">server1,server2,server3</span><br></pre></td></tr></table></figure>\n\n<h3 id=\"Join-Path\"><a href=\"#Join-Path\" class=\"headerlink\" title=\"Join-Path\"></a><code>Join-Path</code></h3><p><code>Join-Path</code> 是 PowerShell 中的一个内置函数，用于将多个路径元素组合成一个完整的路径。`</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">❯ <span class=\"variable\">$folder</span> = <span class=\"string\">"Temp"</span></span><br><span class=\"line\">❯ <span class=\"built_in\">Join-Path</span> <span class=\"literal\">-Path</span> <span class=\"string\">'C:\\Windows'</span> <span class=\"literal\">-ChildPath</span> <span class=\"variable\">$folder</span></span><br><span class=\"line\">C:\\Windows\\Temp</span><br></pre></td></tr></table></figure>\n\n<h2 id=\"StringBuilder\"><a href=\"#StringBuilder\" class=\"headerlink\" title=\"StringBuilder\"></a>StringBuilder</h2><p><code>StringBuilder</code> 是 .NET Framework 中的一个类，用于在运行时动态地创建和修改字符串。它提供了一种更高效的方式来拼接字符串，因为它不会在每次拼接时都创建一个新的字符串对象，而是将拼接后的字符串追加到<code>StringBuilder</code>对象中。</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br><span class=\"line\">3</span><br><span class=\"line\">4</span><br><span class=\"line\">5</span><br><span class=\"line\">6</span><br><span class=\"line\">7</span><br><span class=\"line\">8</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"variable\">$stringBuilder</span> = <span class=\"built_in\">New-Object</span> <span class=\"literal\">-TypeName</span> <span class=\"string\">"System.Text.StringBuilder"</span></span><br><span class=\"line\"></span><br><span class=\"line\">[<span class=\"built_in\">void</span>]<span class=\"variable\">$stringBuilder</span>.Append(<span class=\"string\">"Numbers: "</span>)</span><br><span class=\"line\"><span class=\"keyword\">foreach</span>(<span class=\"variable\">$number</span> <span class=\"keyword\">in</span> <span class=\"number\">1</span>..<span class=\"number\">10000</span>)</span><br><span class=\"line\">{</span><br><span class=\"line\"> [<span class=\"built_in\">void</span>]<span class=\"variable\">$stringBuilder</span>.Append(<span class=\"string\">" <span class=\"variable\">$number</span>"</span>)</span><br><span class=\"line\">}</span><br><span class=\"line\"><span class=\"variable\">$message</span> = <span class=\"variable\">$stringBuilder</span>.ToString()</span><br></pre></td></tr></table></figure>\n\n<h2 id=\"带大括号的描述符\"><a href=\"#带大括号的描述符\" class=\"headerlink\" title=\"带大括号的描述符\"></a>带大括号的描述符</h2><p><code>${<var names>}</code> 这样的调用方式能更好的明确边界</p>\n<figure class=\"highlight powershell\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br><span class=\"line\">2</span><br></pre></td><td class=\"code\"><pre><span class=\"line\"><span class=\"built_in\">Write-Host</span> <span class=\"string\">"<span class=\"variable\">$test</span> <span class=\"variable\">$tester</span> <span class=\"variable\">$</span>(<span class=\"variable\">$test</span>)ter"</span></span><br><span class=\"line\"><span class=\"built_in\">Write-Host</span> <span class=\"string\">"{0} {1} {0}ter"</span> <span class=\"operator\">-f</span> <span class=\"variable\">$test</span>, <span class=\"variable\">$tester</span></span><br></pre></td></tr></table></figure>\n"}],"PostAsset":[],"PostCategory":[],"PostTag":[],"Tag":[]}}