#!/bin/bash
function helpexit() {
    echo "Print or download URLs with consecutive numbers"
    echo "usage example, Download files: $0 http://etc/ 01 .jpg 30 wget"
    echo "usage example, Print URLS: $0 http://etc/ 001 .jpg 30 echo"
    echo "length of first number as a string defines padding"
    exit
}
[[ -z "$1" ]] && helpexit
[[ "$1" = "-h" ]] && helpexit

jotai="$1"
paate="$3"
# From
i=$( echo $2 | sed 's,^0\+,,' )
if [ "$i" = "" ]
then i=0
fi
# To
t=$4
# xargs to
comm=$5
pad=${#2}
if [ -z "$comm" ]
then comm="echo"
fi
while [ "$i" -le "$t" ] 
do
    j=$( printf "%0${pad}d" $i )
    if [ "$comm" = "wget" ]
    then
        echo oo
        # wget -S --spider  | grep __error codes.. (or OK) 
        wget -U 'Mozilla/4.0 (compatible: MSIE 5.5: Windows NT 5.0)' --referer="${jotai}${j}${paate}" "${jotai}${j}${paate}"  
	else 
        echo ${jotai}${j}${paate} | xargs $comm
    fi

    let "i = 1 + $i"
done