Script used in ifeelmaps.com to rename converted images to original ones

rename-imgs.sh

#!/bin/bash

# Rename files file_imagemagick_converted.extension to file.extension
#
# Usage:
#   grep -v imagemagick_converted bigger_imgs | ./rename-imgs.sh
#
# Arguments:
#   stdin - list of filenames

suffix=imagemagick_converted # the suffix used to generate converted images

while read -r filename; # loop over filenames passed over stdin
do
  dot_index=`expr index $filename .` # find the dot index in filename
  name=${filename:0:dot_index-1}     # characters before the dot
  extension=${filename:dot_index}    # characters after the dot

  converted="$name"_"$suffix".$extension

  if [ -e "$converted" ] # converted image exists?
  then
    `mv $converted $filename`
  fi
done