Batch image file size reducer

img_reduce.sh

#!/bin/bash
# Image size reducing script
#
# oxagast <=> Mark Stealer Whitehall

trap cleanup INT

function cleanup()
{
  echo "Cleaning up..."
  rm -f /tmp/img_reduce.f.$$.dat /tmp/img_reduce.pics.$$.dat
}

function help()
{
  echo "$0 -s ~/Media/Pictures/ -d Small_Pics/ -r 40%"
  echo "$0 -s ~/Media/Pictures/ -d Small_Pics/ -r 60% -m 180 -t 8" 
  exit 1;
}

function progress()
{
  tail -f /tmp/img_reduce.f.$$.dat | pv -l -s $totalf -p -N "Converting" 1>/dev/null
}

function threadedconvert()
{
  echo "Aggregating files to convert..."
  find "$src/" -type f \( -name "*.jpg" -or -name "*.JPG" -or -name "*.png" \) -print >/tmp/img_reduce.pics.$$.dat
  totalf=$(cat /tmp/img_reduce.pics.$$.dat | wc -l)
  echo "Starting reduce on $totalf pictures using $threads thread(s)..."
  (
    cat /tmp/img_reduce.pics.$$.dat | while read file; do
      ((i = i % threads))
      ((i++ == 0)) && wait
      justfile=$(echo "$file" | awk -F "/" '{ print $NF }')
      justfile=$(echo "$justfile" | awk -F "." '{ print $1 }')
      if [ "$maxsz" == "0" ]; then
        convert "$file" -resize "$picsz" "$dst/$justfile.jpg" >/dev/null 2>&1 &
      else
        convert "$file" -resize "$picsz" -define jpeg:extent="$maxsz"kb "$dst/$justfile.jpg" >/dev/null 2>&1 &
      fi
      echo "$file" >>/tmp/img_reduce.f.$$.dat
    done
  ) &
}

threadset=0
maxszset=0
srcset=0
dstset=0
picszset=0
while getopts "s:d:r:m:t:h" arg; do
  case $arg in
    s)
      src=$OPTARG
      srcset=1
      ;;
    d)
      dst=$OPTARG
      dstset=1
      ;;
    r)
      picsz=$OPTARG
      picszset=1
      ;;
    m)
      maxsz=$OPTARG
      maxszset=1
      ;;
    t)
      procs=$OPTARG
      threadset=1
      ;;
    h | *)
      help
      ;;
  esac
done
shift $((OPTIND - 1))
if [ $threadset -eq 1 ]; then
  threads="$procs"
else
  threads=8
fi
if [ $maxszset -eq 0 ]; then
  maxsz=0
fi
if [ $srcset -ne 1 ] || [ $dstset -ne 1 ] || [ $picszset -ne 1 ]; then
  help
else
  echo >/tmp/img_reduce.f.$$.dat
  echo >/tmp/img_reduce.pics.$$.dat
  if test ! -d $dst; then
    mkdir $dst
  fi
  src=$(echo "$src" | sed 's:/*$::')
  dst=$(echo "$dst" | sed 's:/*$::')
  threadedconvert "$src" "$dst" "$picsz" "$maxsz" "$threads"
  progress
  cleanup
  exit 0
fi