jpgpngoptimizer

#!/bin/bash

FILE="$1"
TMPDIR="/tmp"
TMPFILE="fake"

if [ $# -eq 0 ]
  then
    echo "No arguments"
    echo "Usage: $0 filename"
    exit 1
fi

if [[ -e "$FILE"  && ${FILE: -4} != ".tmp" ]]
    then
        TYPE=$(file -b --mime-type "$FILE")
        if [[ $TYPE == "image/jpeg" || $TYPE == "image/png" ]]
            then
                FILENAME=$(basename "$FILE")
                TMPFILE="${TMPDIR}/${FILENAME}.tmp"
                echo "Copying $FILE to $TMPFILE"
                cp -f "$FILE" "$TMPFILE"
        fi
    else
        echo "Skip this file: $FILE"
        exit 1
fi

case $TYPE in
    "image/jpeg")
        echo "New jpeg file: $FILE"
        echo "Start processing"
        jpegoptim -f --strip-all "$TMPFILE" && \
            echo "Success optimize" && \
            mv -f "$TMPFILE" "${FILE}".tmp && \
            mv -f "${FILE}".tmp "$FILE" && \
            chmod 0644 "$FILE" && \
            echo "File renamed back from $TMPFILE to $FILE"
        ;;
    "image/png")
        echo "New png file: $FILE"
        optipng -force -o7 "$TMPFILE" && \
        advpng -z4 "$TMPFILE" && \
        pngcrush -rem gAMA -rem alla -rem cHRM -rem iCCP \
                 -rem sRGB -rem time "$TMPFILE" "${TMPFILE}".tmp && \
                 mv -f "${TMPFILE}".tmp "${FILE}".tmp && \
                 mv -f "${FILE}".tmp "$FILE" && \
                 chmod 0644 "$FILE" && \
                 echo "Renamed back from ${TMPFILE}.tmp to $FILE"
        ;;
    *)
        rm -f "$TMPFILE"
        exit 1
        ;;  
esac

if [ -e "$TMPFILE" ]
    then
        rm -f "$TMPFILE" && echo "Temporary file $TMPFILE deleted"
fi

exit 0