bash

Preferred Bash Shebang

#!/usr/bin/env bash

env runs a program in a modified environment, the command in this case being the first copy of bash found within ${PATH}.

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Location of Bash Script

SCRIPT_DIR="$( cd -P -- "$( dirname -- "$(readlink -f "${BASH_SOURCE[0]}")" )" >/dev/null 2>&1 && pwd )"

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Bash Strict Mode

#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'

• -e: immediately exit if a command has a non-zero exit status
• -u: references to an undefined variable cause the script to exit
• -o pipefail: returns non-zero exit statuses from any command in a set of piped commands instead of the exit code of the final command
• IFS: each character is a delimiter used by bash for separating arguments, so we avoid arguments with spaces, for example, being incorrectly parsed in bash loops

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Bash Exit Traps for Cleanup

At the start of your file set up a trap with a cleanup function that should be run.

#!/usr/bin/env bash

function finish {
  # cleanup
}
trap finish EXIT

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