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  • Good example C comments /**

  • Copies the default config to startup.

  • Reads the default config file/partition,

  • stripping the headers and validating the md5sum,

  • and writes it to the startup config.

  • @param msg - destanation masage

  • @retval 0 if successful.

  • @retval 1 if the default config does not exist.

  • @retval other in case of error. */

  • Sites for test regular expression https://www.debuggex.com/ https://regexper.com/

  • How remove attribute ** Install yaourt mat mutagen perl-image-exiftool ** Check mat -c ** Show metadata mat -d ** Delete metadata mat -b

  • How add fat and ntfs tools pacman -S dosfstools ntfsprogs

  • How add file system for flash pacman -S f2fs-tools

  • ASCIIFLOW http://nightly.ascii-flow.appspot.com/#Draw

  • Service for found photo snradar.azurewebsites.net

  • How setup WiFi card on promiscuous mode ** Find your phy iw phy ** Add new interface iw phy phyX interface add mon0 type monitor iw dev mon0 del ** With iw iw dev wlan0 set type monitor iw dev wlan0 set type managed ** Set channel for listen iw dev wlan0 set channel channel

  • Unprivileged power management pacman -S polkit

  • Objdump ** objdump -D file ** addr2line -e file -a 0x(addr) ** strip

** Crypt setup *** Edit /etc/default/grub cryptdevice=/dev/sda2:name_crypt

  • Draw gpaphs pacman -S graphviz

  • Validator json https://jsonlint.com/

  • How upgrade ssh id_rsa openssl pkcs8 -topk8 -v2 des3 -in id_rsa.old -out id_rsa

  • Hex editor hexer

  • Disable kerlen printk logs echo 0 > /proc/sys/kernel/printk

  • i3 how find key name ** xev ** xmodmap -pke

  • Count lines code tokei

  • Disable installing default gw and dns from DHCP ** Open /etc/dhcpcd.conf and add to end ** interface iface_name ** nogateway ** nohook resolv.conf

  • Setup fail2ban ** fail2ban/action.d/iptables-blocktype.local *** [Init] *** blocktype = DROP ** fail2ban/jail.d/sshd.local *** [sshd] *** enabled = true *** maxretry = 5 *** ignoreip = 127.0.0.1/8 *** port = 22

  • graphviz online ** http://dreampuf.github.io/GraphvizOnline/

  • Show font symbols ** Print font family fc-query some.ttf or some.otf ** Print font symbols xfd -fa "SomeFontFamily"

  • How unpack initramfs image ** zcat /boot/initramfs-linux.img > some.cpio ** cpio -vid < some.cpio

  • How run another display server ** Run server Xephyr :1 -ac -screen 640x480x8 ** Run app DISPLAY=:1 app

  • Utils ** NCurses Disk Usage ncdu ** Convert djvu to pdf (djvulibre) ddjvu -format=pdf in.djvu out.pdf

  • Wireshark ** How decrypt HTTPS session *** Set environment var SSLKEYLOGFILE=/tmp/ssl.log *** Setup wireshark Edit -> Preferences -> Protocols -> TLS -> (Pre)-Master-Secret log filename

  • Markdown online editor ** https://stackedit.io/app#

  • Validate server SSL/TLS ** https://www.geocerts.com/ssl-checker ** https://www.ssllabs.com/ssltest/analyze.html

  • Online compiler into assember ** https://godbolt.org/