README.md

Shellscript

Expression	Description
`-d file`	True if file is a directory.
`-e file`	True if file exists.
`-f file`	True if file exists and is a regular file.
`-L file`	True if file is a symbolic link.
`-r file`	True if file is a file readable by you.
`-w file`	True if file is a file writable by you.
`-x file`	True if file is a file executable by you.
`file1 -nt file2`	True if file1 is newer than (according to modification time) file2
`file1 -ot file2`	True if file1 is older than file2
`-z string`	True if string is empty.
`-n string`	True if string is not empty.
`string1 = string2`	True if string1 equals string2.
`string1 != string2`	True if string1 does not equal string2.

# Ask for the administrator password upfront
sudo -v


# Tells the shell script to exit if it encounters an error
set -eo pipefail
set -e