#!/bin/bash

WIDTH=$1
if [[ $WIDTH == '' ]]
then
    echo "Usage: $0 (resize_width_number)"
    echo "Eample: $0 512"
    echo "That will resize picture to width: 512px, height: automaticaly calculated.. :)"
    exit;
fi

for i in `ls *.jpg`
do
    echo -n "Converting file: $i"
    SW=`identify $i|awk '{ print $3 }'|cut -d x -f 1` # width of file
    SH=`identify $i|awk '{ print $3 }'|cut -d x -f 2` # height of file
    let PERCENTAGE=(WIDTH*100)/SW;
    FS=`echo $i|cut -d '.' -f 1`
    FE=`echo $i|cut -d '.' -f 2`
    NF="$FS-resized.$FE"
    echo " to "$SW"px -> "$WIDTH"px("$PERCENTAGE"%) -> $NF"
    convert $i -resize $PERCENTAGE $NF
done