a bash script to gather p30download.com links to for download

pdlist.sh

#!/bin/bash

if [[ "$#" -ne 2 ]]; then
    echo "usage pdlist <filename> <number_of_parts>"
    exit 1
fi

parts="$2"
filename="$1"

partnum=$(echo ${filename##*part})
partnum=$(echo ${partnum%%.*})
partnum=$(echo ${#partnum})

for ((i = 1; i <= $parts; i++)); do
    if [[ $partnum -eq 2 ]]; then
        filenum=$([[ $i -gt 9 ]] && echo "$i" || echo "0$i")
    elif [[ $partnum -eq 1 ]]; then
        filenum="$i"
    fi
    newfilenum=$(echo $filename | sed "s|part[0-9]*|part$filenum|")
    echo $newfilenum
done
exit 0