#!/bin/bash
# Reorders the lines in a file after the specified sequence of numbers:
# reorder file 1,2,3,4
# See:
# http://stackoverflow.com/questions/15639888/reorder-lines-of-file-by-given-sequence
paste <(echo "$2" | sed s/,/\\n/g) "$1" | sort | sed "s/^[0-9]*\s//"