Bash script that recollect all files ignored in a git project by the .gitignore file

git_ignore_backup.sh

#!/bin/bash
## Git ignore backup script

function compress() {
	files=$(grep -v '^\s*#' < .gitignore)
	env GZIP=-9 tar cvzf $1.tar.gz $files 2> ignore_backups_errors.txt
	exit 0
}

if [[ -z "$1" ]]; then 
	compress backup_ignore
else
	compress $1
fi