README.md

Compressed File Size Sum Script

By Jesús Mena.

This script sums the size of all compressed files in a directory. It accepts three mutually exclusive and optional arguments, -K, -M and -G. This arguments are used to get the result in kilobytes, megabytes and gigabytes respectively. If no arguments are given the result is shown in bytes.

zipsizesum.sh

#!/bin/bash

function usage () {
	cat <<EOF
Usage: $0 [-K|-M|-G]
where:
	-K		returns result in KB
	-M		returns result in MB
	-G		returns result in GB

Sums the size of all compressed files in the current directory.
EOF
	exit 0
}

if [ "$1" = "--help" ]; then
	usage
fi

factor=1
unity=''

while getopts ":KMG" opt; do
	case $opt in
		K) [[ -n "$unity" ]] && usage || factor=1024; unity='KB'; ;;
		M) [[ -n "$unity" ]] && usage || factor=1048576; unity='MB'; ;;
		G) [[ -n "$unity" ]] && usage || factor=1073741824; unity='GB' ;;
		\?) echo "Invalid option: -$OPTARG"; usage ;;
	esac
done

for i in *.zip; do unzip -l $i | tail -n 1; done | awk -v awk_factor=$factor -v awk_unity=$unity '{ total += $1 }; END { printf("%.2f%s\n",total/awk_factor,awk_unity) }'