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#!/usr/bin/env bash
#
# shock(1) -- Run a command on every hostname returned by shoal(1) and print
# the hostname if the command's return value was zero. Discard stdout, but do
# print stderr.
#
# Author: Tom Ryder <tom@sanctum.geek.nz>
# Copyright: 2014
# License: Public domain
#
# Name self
self=shock
# 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 command given
if ! (($#)) ; then
printf 'USAGE: %s <command>\n' "$self" >&2
exit 1
fi
# Execute command, print hostname if it returns zero
while read -r hostname ; do
# shellcheck disable=SC2029
if ssh -nq -- "$hostname" "$@" >/dev/null ; then
printf '%s\n' "$hostname"
fi
done < <(shoal)
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