Naive tool for distributed execution of commands and shell scripts on remote machines

remote-script.sh

#!/bin/bash

# author: jask
# WARNING: this script is intended to use only for those who have deep understanding how it works, so enjoy the fun with it ;)

interpret='bash'
#ssh_args='-i .ssh/atollon'
#user='jask'

usage(){
    cat <<EOF
Run local bash script on remote hosts.
Warning: Uses parallel proccesses without good management!
Usage: $0 [OPTIONS] [hosts]
Options:
  -s          Will run in sudo
  -f path     Path to the script. If note set, standard input will be used
  -a args     args string will be passed as list of arguments to the script (use with -f)
  -c command  Instead of script file you can set bash oneliner
  -x          Run bash in debug mode (bash -x)
  -h path     Path to the file with list of remote hosts
  -q          Silences outputs from hosts, with return code zero
Examples:
  ./remote-script.sh -s -f create_user.sh -a "jura '\$( cat jura.pub )'" -h lagoons
EOF
}

while [ -n "$1" ]; do
    case "$1" in
      -s) sudo='sudo';;
      -f) file=$2; shift;;
      -c) com="$com $2;"; shift;;
      -x) mods="$mods -x";;
      -h) hosts="$hosts $( cat $2 )"; shift;;
      -i) interpret="$2"; shift;;
      -m) mods="$mods $2"; shift;;
      -A) ssh_args="$ssh_args $2"; shift;;
      -a) args="$args $2"; shift;;
      -u) user=$2; shift;;
      -e) vars="$vars $2"; shift;;
      -q) quiet='yes';;
      -t) clock='time';;
      *) hosts="$hosts $1";;
    esac
    shift
done

[ -z "$hosts" ] && usage >&2 && exit 1

if [ -z "$file" ]; then
    file=$( mktemp )
    tmp=1
    if [ -n "$com" ]; then
        echo "$com" > $file
    else
        cat > $file
    fi
fi

[ -n "$user" ] && user="$user@"
tmpd=$( mktemp -d )
touch $tmpd/blank

proceed(){
    log=$tmpd/$host
    echo "==== $host ====" > $log
    cat $file | ssh $ssh_args ${user}${host} "$clock $sudo $vars $interpret $mods -s $args 2>&1; echo \$?" >> $log
    [ "$quiet" == 'yes' -a "$( tail -1 $log )" -eq 0 ] && rm -f $log && return
    echo >> $log
}

for host in $hosts; do
    proceed &
done

wait
cat $tmpd/*

[ -n "$tmp" ] && rm -f $file
rm -rf $tmpd