Assign a command to a variable - Help Post: 303035094

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Top Forums UNIX for Beginners Questions & Answers Assign a command to a variable - Help Post 303035094 by mohca2020 on Tuesday 14th of May 2019 02:53:22 PM

05-14-2019

Registered User

Assign a command to a variable - Help

Hi,

I have the script below. When i assign SSH_COMMAND to "ssh -o ConnectTimeout=2 ${SERVER} ${AS_SUDO} ${COMMANDS}" and then execute it as ${SSH_COMMAND} I get the following error:

Code:

ssh: Could not resolve hostname sudo: Name or service not known
ssh: Could not resolve hostname sudo: Name or service not known

But when I run the command directly from the script, it works as expected. The script below is running as expected. Can you guys help?

Code:

#!/bin/bash
#set -x


function usage {
    echo "USAGE: ${0} [-nsv] [-f FILE] COMMAND"
    echo "-f FILE   Use to override the default file"
    echo "-n        Use for dry Run"
    echo "-s        Use to run the command with sudo"
    echo "-v        Use for verbose"
}


SERVERFILE="/vagrant/servers"

if [[ ! -e "${SERVERFILE}" ]]; then
    echo "File ${SERVERFILE} does not exist"
    exit 0

fi

if [[ ${#} -lt 1 ]]; then
    usage
fi

if [[ ${UID}  -eq 0 ]]
then
echo "Do not execute this as root, use -s instead"
fi


while getopts 'nsvf:' opt
do
    case "${opt}" in
        n)
            DRY_RUN="true"   ;;
        s)
            AS_SUDO="sudo" ;;
        f)
            SERVERFILE=${OPTARG}  ;;
        v)
            echo "verbose mode"    ;;
    esac
done
shift "$(( OPTIND-1 ))"

COMMANDS=${*}
SSH_COMMAND="ssh -o ConnectTimeout=2 ${SERVER} ${AS_SUDO} ${COMMANDS}"

if [[ ! -z ${DRY_RUN} ]]
then
    echo "DRY RUN: ${SSH_COMMAND}"
else
    for SERVER in $(cat ${SERVERFILE})
    do
        #${SSH_COMMAND}
        ssh -o ConnectTimeout=2 ${SERVER} ${AS_SUDO} ${COMMANDS}
    done
fi

mohca2020

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LEARN ABOUT BSD

ssh-argv0

SSH-ARGV0(1)						    BSD General Commands Manual 					      SSH-ARGV0(1)

NAME

     ssh-argv0 -- replaces the old ssh command-name as hostname handling

SYNOPSIS

     hostname | user@hostname [-l login_name] [command]

     hostname | user@hostname [-afgknqstvxACNTX1246] [-b bind_address] [-c cipher_spec] [-e escape_char] [-i identity_file] [-l login_name]
     [-m mac_spec] [-o option] [-p port] [-F configfile] [-L port:host:hostport] [-R port:host:hostport] [-D port] [command]

DESCRIPTION

     ssh-argv0 replaces the old ssh command-name as hostname handling.	If you link to this script with a hostname then executing the link is
     equivalent to having executed ssh with that hostname as an argument.  All other arguments are passed to ssh and will be processed normally.

OPTIONS

     See ssh(1).

FILES

     See ssh(1).

AUTHORS

     OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen.  Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
     Theo de Raadt and Dug Song removed many bugs, re-added newer features and created OpenSSH.  Markus Friedl contributed the support for SSH
     protocol versions 1.5 and 2.0.  Jonathan Amery wrote this ssh-argv0 script and the associated documentation.

SEE ALSO

     ssh(1)

Debian Project							 September 7, 2001						    Debian Project

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