#!/bin/bash
set -euo pipefail
IFS=$'\n\t'
set -e will exit the script if any command returns a non-zero status code. To prevent the option from triggering on commands returning a non-zero status code even when no error occurred, there are two solutions:- using the
|| true pattern: command_returning_non_zero || true
- temporary disabling the option:
set +e
command_returning_non_zero
set -e
set -u will prevent using an undefined variable. In the case of undefined positional parameters ($1, $2,…), you can give them a default value with the parameter expansion construct: my_arg=${1:-"default"}set -o pipefail will force pipelines to fail on the first non-zero status code.IFS=$'\n\t’ makes iterations and splitting less surprising, in the case of loops mostly. The default for this variable is usually IFS=$' \n\t’ but the space as a separator often gives confusing results.