procimage

linux脚本编程的例子

filename=$1
extension=${filename##*.}
ppmfile=${filename%.*}.ppm
outfile=${filename%.*}.gif

if [ -z $filename ]; then
    echo "procfile: No file specified"
    exit 1
fi

if [ $extension = gif ]; then
    exit 0
elif [ $extension = tga ]; then
    tgatoppm $filename > $ppmfile
elif [ $extension = xpm ]; then
    xpmtoppm $filename > $ppmfile
elif [ $extension = pcx ]; then
    pcxtoppm $filename > $ppmfile
elif [ $extension = tif ]; then
    tifftopnm $filename > $ppmfile
elif [ $extension = jpg ]; then
    djpeg $filename > $ppmfile
else
    echo "procfile: $filename is an unknown graphics file."
    exit 1
fi

ppmquant -quiet 256 $ppmfile | ppmtogif -quiet > $outfile

rm $ppmfile