README.md

File Size Sum Script

By Jesús Mena.

This script sums the size of all files in a directory (the current directory by default). 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.

sizesum.sh

#!/bin/bash

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

Sums the size of all files in a directory (the current directory by default).
EOF
	exit 0
}

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

directory=''
factor=1
unity=''

if [ $# -lt 2 ]; then
	directory=$1
fi

while getopts ":KMG" opt; do
	case $opt in
		K) [[ -n "$unity" ]] && usage || factor=1024; directory=$2; unity='KB'; ;;
		M) [[ -n "$unity" ]] && usage || factor=1048576; directory=$2; unity='MB'; ;;
		G) [[ -n "$unity" ]] && usage || factor=1073741824; directory=$2; unity='GB' ;;
		\?) echo "Invalid option: -$OPTARG"; usage ;;
	esac
done

ls $directory -FaGl | awk -v awk_factor=$factor -v awk_unity=$unity '{ total += $4 }; END { printf("%.2f%s\n",total/awk_factor,awk_unity) }'