Bash (Unix shell): Difference between revisions
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* <code>-gt</code> is <code>></code> | * <code>-gt</code> is <code>></code> | ||
* <code>-ge</code> is <code>>=</code> | * <code>-ge</code> is <code>>=</code> | ||
===Check if File/Folder Exists=== | |||
See [https://linuxize.com/post/bash-check-if-file-exists/#check-if-directory-exist https://linuxize.com/post/bash-check-if-file-exists/#check-if-directory-exist]. | |||
==<code>.bashrc</code>== | ==<code>.bashrc</code>== |
Revision as of 06:44, 7 June 2020
Bash Scripting
Getting Started
Here is an example bash script
#!/bin/bash
# A simple variable example
myvariable=Hello
anothervar=Fred
echo $myvariable $anothervar
You can check your bash scripts using https://www.shellcheck.net/.
Usage
Basic If Statements
https://linuxize.com/post/bash-if-else-statement/
if [[ $VAR -gt 10 ]] then
echo "The variable is greater than 10."
elif [[ $VAR -eq 10 ]] then
echo "The variable is equal to 10."
else
echo "The variable is less than 10."
fi
Comparisons
-eq
is==
-gt
is>
-ge
is>=
Check if File/Folder Exists
See https://linuxize.com/post/bash-check-if-file-exists/#check-if-directory-exist.
.bashrc
Your .bashrc
file will be loaded for each terminal.
Presentation of Shell Variable
Add the following to show your
PS1='\[\e]0;\u@\h: \w\a\]${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$'