gistfile1.txt

#!/bin/bash
# [Purpose]
# execute a command on remote servers 
# note: we are basically rolling our own pssh here, without the parallelism

#Example: command.sh -tv -c "date" server1 special@server2 server3
#         command.sh -tv -c "date" -i key.pem -l "user" server1 special@server2 server3
#         command.sh -tv -i key.pem server2 server3 < get_date.sh
#         command.sh -tbv -l cap -i ~/keys/cap.pem ${app_[@]} < build.sh

IDENTITY_FILE_OPTION=
REMOTE_CMD=
DEFAULT_USER_OPTION=
BATCH_OPTION=
ERROR_TERMINATE=
VERBOSE=

_read_from_flag=
_cumulative_result=

if [ -t 0 ]; then
    _read_from_flag=1
else 
    REMOTE_CMD=$(cat <&0)
fi

usage () {
cat << EOF
Usage: `basename $0` [-btv] [-i identity_file] [-l default_user]
                   [-c bash_commands] [user@]host1 ... [user@]host2 [< command_file]
EOF
}
while getopts “:hbtvi:c:l:” OPTION; do
    case $OPTION in
        h)
            usage
            exit 1
        ;;
        b)
            BATCH_OPTION="-o BatchMode=yes"
        ;;
        t)
            ERROR_TERMINATE=1
        ;;
        v)
            VERBOSE=1
        ;;
        i)
            if [ -e $OPTARG ]; then
                IDENTITY_FILE_OPTION="-i $OPTARG"
            else
                echo "Warning: Identity file $OPTARG not accessible: No such file or directory."
            fi
        ;;
        c)
            if [ $_read_from_flag ]; then
                REMOTE_CMD="$OPTARG"
            else
                echo "Error: Cannot combine stdin and input script"
                usage
                exit 1
            fi
        ;;
        l)
            DEFAULT_USER_OPTION="-l "`cut -d ' ' -f1 <<< "$OPTARG"`
        ;;
        ?)
        usage
        exit
        ;;
    esac
done
shift $(( OPTIND - 1 ))

if [ "$_read_from_flag" -a ! "$REMOTE_CMD" ] ; then
    echo "Error: No command specified, either \"-s 'bash_commands'\" or \"< command_file\" required"
    usage
    exit 1
fi
if ! (( ${#@} )); then
    echo "Error: No host specified"
    usage
    exit 1
fi

if [ $VERBOSE ]; then
    exec 3>&1
else
    exec 3>/dev/null
fi 
for SERVER in "$@"; do
    (( i++ ))
    _time=$( date +'%H:%m:%S' )
    if [ $VERBOSE ]; then echo -e "\x1B[36m[$i:${#@}]\x1B[0m $_time \x1B[33m[WORKING]\x1B[0m $SERVER"; fi
    # the bottom one should not have command line length limitations
    if [ "$_read_from_flag" ]; then
        errors=$( { ssh -q -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no $BATCH_OPTION $IDENTITY_FILE_OPTION $DEFAULT_USER_OPTION $SERVER "$REMOTE_CMD" ; }  2>&1 1>&3 )
        _result=$?
    else
        errors=$( { ssh -q -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no $BATCH_OPTION $IDENTITY_FILE_OPTION $DEFAULT_USER_OPTION $SERVER 'bash -s' <<< "$REMOTE_CMD" ; }  2>&1 1>&3 )
        _result=$?
    fi
    _time=$( date +'%H:%m:%S' )
    (( _cumulative_result |= $_result )) 
    echo -n -e "\x1B[36m[$i:${#@}]\x1B[0m $_time "
    if (( $_result )); then
        echo -e "\x1B[1;31m[FAILURE]\x1B[0m $SERVER \x1B[1;31mExited with error code $_result\x1B[0m"
        if [ "$errors" ]; then
            echo -e "\x1B[31mStderr:\x1B[0m $errors"
        fi
        if [ $ERROR_TERMINATE ];then
            echo -e "\x1B[31m[TERMINATING]\x1B[0m As requested"
            break;
        fi
    else
        echo -e "\x1B[32m[SUCCESS]\x1B[0m $SERVER"
    fi
done
exec 3>&-;
exit $_cumulative_result