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I want that script to work file by file.

Not all files. At the moment it changes all png files for example.

I dont want simple solution. I want a bit advanced solution like that script, but...

#!/bin/sh

fromext="$1"
toext="$2"

usage () {
echo "Usage: $0 fromext toext"
echo "Example: $0 htm html"
}

if [ -z "$1" ] || [ -z "$2" ]
then
echo "Too few arguments."
usage
...

Thanks that is good but maybe someone has more solutions ?

I searched the forum, but there was different type of rename.

Hello.

I have files in folder.

Like:

xxxxxxxx1.html
or
xxxxxxxx2.txt
or
xxxxxxxx3.tar.gz

and how to rename or change...