#!/bin/sh -e

cmd=`which "$3"` || true

[ -f "$1" ] && [ -d "$2" ] && [ -x "$cmd" ] || {
    echo "Execute a command for all debs in an archive"
    echo "Usage: $0 <packages file> <archive root dir> <command>"
    exit 1
}

list=`readlink -f "$1"`

cd "$2"
zgrep ^Filename: "$list" | cut -f 2- -d\  | xargs -l1 $cmd