[Bash] Rename files sequentially and padding 2

I’ve updated my last script in order to be able to manage different file extensions provided as parameters.

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[Bash] Rename files sequentially and padding

Maybe I’ve just reinvented the hot water. But I needed it and it took me less time to write it on my own than searching for the solution.

The task was to take all files in a directory and copy them into an output directory renaming them sequentially starting from a provided number. So files will be something like 0000.jpg, 0001.jpg, …, 0035.jpg, etc.

Less words as usual 🙂

#!/bin/bash
# copy all files in the directory to an output one renaming them
# sequentially.
#
#          GNU LESSER GENERAL PUBLIC LICENSE
#               Version 2.1, February 1999
#
# Copyright (C) 1991, 1999 Free Software Foundation, Inc.
# 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
# Everyone is permitted to copy and distribute verbatim copies
# of this license document, but changing it is not allowed.
#
# http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
#

OUT_DIR=out
PAD_LENGTH=5

if [ -z "$1" ] || [ -z "$2" ] ; then
   echo "./move.sh <number-to-start-from> <extension>"
   echo " "
   echo "./move.sh 12 JPG"
else
   # testing output directory exist. if not create it.
   if [ ! -d ${OUT_DIR} ] ; then
      mkdir ${OUT_DIR}
   fi
   
   COUNTER=$1
   EXT=$2
   
   for file in *.${EXT} ; do
      OUTFILE=$(printf "%0${PAD_LENGTH}i\n" "${COUNTER}")
      cp -v $file ${OUT_DIR}/${OUTFILE}.${EXT};
      let COUNTER++;
   done
fi

Here is the source code (pdf) for easy read/copy/paste.