Image Optimisation script used utils, optipng,

gistfile1.sh

#!/bin/bash

    DIR=$1;
    DIR=`echo $1 |sed -e 's,\(.\)/$,\1,'`

    back() {
    mkdir "$DIR.old";
    for i in `ls $DIR`;
    do
    cp -r $DIR/$i $DIR.old;
    done;
    echo "Your files copied to $DIR.old...."
    }

    tran() {
    echo "Start OPTIMIZING...."
    for file
    in `find $DIR -iname "*.jpg" -or -iname "*.png" -or -iname "*.jpeg" -or -iname "*.gif"`;
    do

    if [ -z "$file" ]; then
        echo "Usage: optimize-image.sh filename"
	exit 1;
    fi
    
    if [ ! -f "$file" ]; then
	echo "$file is not a file"
        exit 1;
    fi
    
    TYPE=`identify "$file" | grep -E -o 'JPEG|GIF|PNG'`
    OLD=`stat -c %s "$file"`

    case "$TYPE" in
    JPEG)
        jpegtran -copy none -optimize -perfect -progressive -outfile "$file.tmp" "$file"
        jpegtran -copy none -optimize -perfect -outfile "$file.tmq" "$file"
        if [ -f "$file.tmp" -a -f "$file.tmq" ]; then
            S_PROG=`stat -c %s "$file.tmp"`
            S_NORM=`stat -c %s "$file.tmq"`
            if [ $S_PROG -ge $S_NORM ]; then
                mv -f "$file.tmq" "$file"
                rm -f "$file.tmp"
            else
                mv -f "$file.tmp" "$file"
                rm -f "$file.tmq"
            fi;
        fi
    ;;
    GIF)
        gifsicle -O2 -b "$file"
    ;;
    PNG)
        optipng "$file"
        advpng -z -4 -q "$file"
        ;;
    esac
    NEW=`stat -c %s "$file"`
    echo "$file, old size: $OLD, new size: $NEW"

    done;
    echo "OPTIMIZE IS DONE!";
    echo "You can find your files before optimization in $DIR.old"
    }

    dojob() {
       if [ -z "$DIR" ]; then
           echo "Script usage: ./optimize-image.sh /dirname"
           exit 1
       else
           back
           tran
       fi
    }

  echo "Script is starting...."
  dojob
  echo "Script job finished"
  exit 0