It's very useful to use ShellCheck to check any shell code you write.

Notes

• The proper she-bang for Bash is #!/usr/bin/env bash.

Links

• ​Parameter expansion​

• ​Defensive BASH Programming​

• ​Safe ways to do things in Bash (HN comments)

• ​Pure Bash Bible - Collection of pure bash alternatives to external processes.

• ​Bash Infinity - Modern boilerplate / framework / standard library for Bash.

• ​Funky - Takes shell functions to the next level by making them easier to define, more flexible, and more interactive.

• ​create-bash-script - Bash script designed to create other bash scripts with argument parsing.