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#!/usr/bin/env bash
#
# scatter(1) -- Run a command on every hostname returned by shoal(1) and print
# both stdout and stderr, including allocating a pty with -t.
#
# Author: Tom Ryder <tom@sanctum.geek.nz>
# Copyright: 2014
# License: Public domain
#
# Name self
self=scatter
# Handle ^C interrupts
trap 'trap - INT; kill -INT $$' INT
# Bail if we couldn't find shoal(1)
hash shoal || exit
# Exit with usage method if no arguments given
if ! (($#)) ; then
printf 'USAGE: %s <command>\n' "$self" >&2
exit 1
fi
# Execute command, print both stdout and stderr, and use file descriptor 3 to
# avoid clobbering any of the standard streams
while read -r hostname <&3 ; do
printf '%s: %s\n' "$self" "$hostname"
# shellcheck disable=SC2029
ssh -qt -- "$hostname" "$@"
printf '\n'
done 3< <(shoal)
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