dnlcrl/bulk_rename.sh

## bulk_rename.sh
#! /bin/sh

# rename  all PNGs in . from 0001.png to 0004.png
a=1;
for i in *.png; do
  new=$(printf "%03d.png" "$a");
  mv -- "$i" "$new";
  let a=a+1;
done
	#! /bin/sh

	# rename all PNGs in . from 0001.png to 0004.png
	a=1;
	for i in *.png; do
	new=$(printf "%03d.png" "$a");
	mv -- "$i" "$new";
	let a=a+1;
	done