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#!/bin/bash
parssh () {
(( $# )) || {
_parssh_usage
return $?
}
local origopts=$-
set -m
local _parssh_prepend_host=true
while [[ "$1" == -* ]]; do
case ${1#-} in
[0-9]*)
[[ "${1#-}" != *[^0-9]* ]] && {
local _parssh_concurrency=${1#-}
}
;;
s|-servers)
[[ -r "$2" ]] || {
echo "'$2': invalid file name or permissions issue"
return 99
}
local _parssh_servers="$2"
shift
;;
r|-rinput)
[[ -r "$2" ]] || {
echo "'$2': invalid file name or permissions issue"
return 98
}
local _parssh_rinput="$2"
shift
;;
b|-bare)
unset _parssh_prepend_host
;;
h|-help)
_parssh_usage
return $?
;;
esac
shift
done
[[ -z "$_parssh_servers" ]] && {
exec 9<&0
} || {
exec 9<"$_parssh_servers"
}
while read host; do
while (( $(jobs -pr | wc -l) >= ${_parssh_concurrency:-4} )); do
sleep 1
done
if [[ -z "$_parssh_rinput" ]]; then
ssh -no StrictHostKeyChecking=no $host "$@" |\
_parssh_host_prepend &
else
ssh -To StrictHostKeyChecking=no $host "$@" < "$_parssh_rinput" |\
_parssh_host_prepend &
fi
done <&9
wait
exec 9>&-
[[ "${origopts//[^m]/}" == "m" ]] || set +m
}
_parssh_host_prepend ()
while read -r; do
printf "${_parssh_prepend_host+$host: }%s\n" "$REPLY"
done
_parssh_usage () {
printf ' %s\n'\
"SYNOPSIS"\
"parssh [-NUM] [-r|--rinput FILE] [-s|--servers FILE] [-b|--bare] [COMMANDS] [< SERVERS]"\
""\
"DESCRIPTION"\
" -NUM (default: 4)"\
" Number of concurrent ssh connections to maintain. E.g. '-40'."\
" -r FILE, --rinput FILE (default: unset/inactive)"\
" File to send as STDIN redirection on remote servers."\
" (Can be used as replacement for or in conjunction with COMMANDS)."\
" -s FILE, --servers FILE (default: unset/inactive)"\
" File to use as list of servers to run COMMANDS on."\
" (Cannot be used in conjunction with a server list on STDIN)."\
" -b, --bare (default: unset/inactive)"\
" Disable prepending of hostname to each output line returned by COMMANDS on SERVERS."\
" COMMANDS"\
" The list of commands to be executed remotely by SSH on each SERVER."\
" < SERVERS"\
" Unless '-s' flag is used, STDIN will be used as list of remote servers."\
" (Deliniated by whitespace)."
return 1
}
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