Script bash per creare un archivio diff partendo da due cartelle contenenti installazioni di YOURLS (https://github.com/YOURLS/YOURLS), vedi https://go.gioxx.org/yourls-diff

crea_diff.sh

#!/bin/sh

# Credits:
#	https://askubuntu.com/questions/444082/how-to-check-if-1-and-2-are-null
#	http://linuxcommand.org/lc3_wss0120.php

if [ "$1" != "" ] && [ "$2" != "" ]; then
	echo; echo "Old version = " $1
	echo "New version = " $2; echo;
	diff -rs $1 $2 | awk '/sono identici/{print $5}' | xargs rm -v
	zip -r $2_diff.zip $2
else
    echo "-ERROR-"
	if [ -z "$1" ]; then echo "Old version folder missing"; fi
	if [ -z "$2" ]; then echo "New version folder missing"; fi
    echo "Script usage: crea_diff.sh OLDVERSIONFOLDER NEWVERSIONFOLDER"
fi