/tmp/bundle # bundle - combine multiple files into one
/tmp/bundle 
/tmp/bundle { print FILENAME, $0 }
/tmp/unbundle # unbundle - unpack a bundle into separate files
/tmp/unbundle 
/tmp/unbundle $1 != prev { close(prev); prev = $1 }
/tmp/unbundle            { print substr($0, index($0, " ") + 1) >$1 }