#! /bin/sh
set -e

## Parse the command line.
case "$#" in
  0 | 1)
    echo >&2 "Usage: $0 COMMAND SLAVE|:SET ..."
    exit 1
    ;;
esac
command=$1; shift

## Expand slaves into a big list.
slaves=$(expand-list /etc/slaves "$@")

## Now do the stuff.
for i in $slaves; do
  { { { echo "starting..."
	set +e; ssh "$i" "$command" 3>&-; rc=$?; set -e
	echo "done (rc = $rc)"; } >&3; } 2>&1 |
    while IFS= read -r line; do printf "!!! %s\n" "$line"; done; } 3>&1 |
  while IFS= read -r line; do printf "%s: %s\n" "$i" "$line"; done &
done
wait