bin/fnadd at master · gnovak/bin · GitHub

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#!/bin/bash
if [ "$#" = "0" ]; then
	echo Usage is not like that
	exit
fi

for oldfile in $* ; do
	# skip first arg b/c it's the number to add
	if [ $oldfile != $1 ]; then
		num=`echo $oldfile | sed s/[0-9]*-// | sed s/-.*//`
		# sadly, strip leading 0's
		strnum=`echo $num | sed s/^0*//`
		newnum=$[ $strnum + $1 ]
		# now try to put leading zero's back in
		if let $[ $newnum < 10 ]; then
			unstrnewnum="0000$newnum"
		elif let $[ $newnum < 100 ]; then
			unstrnewnum="000$newnum"
		elif let $[ $newnum < 1000 ]; then
			unstrnewnum="00$newnum"
		elif let $[ $newnum < 10000 ]; then
			unstrnewnum="0$newnum"
		else
			unstrnewnum=$newnum
		fi
		newfile=`echo $oldfile | sed s/-$num-/-$unstrnewnum-/`
		echo $oldfile $newfile
		mv $oldfile $newfile.tmp
	fi
done

for file in *.tmp ; do
    mv $file `echo $file | sed s/.tmp$//`
done

#xmv tmp