How I write bash

Posted on: Sun 01 March 2020

Tags: #bash, #command-line

This is a short guide to help me write bash scripts since I usually tend to review my previous code in order to remember how I write Bash.

This is what I usually start every bash script with:

#!/bin/bash

set -o errexit
set -o nounset
set -o pipefail

The shebang subject has been discussed about quite a bit.

The others are flags that make errors easier to debug.

if (( variable <= 0 )); then
    echo "HI"
fi

Check if a string exists

if [[ -n ${variable} ]]; then
    echo "HI"
fi

for file in $(ls); do
    echo $file
done

STRINGS='one two'

for STRING in $STRINGS; do
    echo $STRING
done