how to execute if else condition with ssh to remote server

Question

I am using following script to remote connection to a server and then if connection is successful then echoing success and if success then trying to sudo a file .If connection failed then it should echo FAIL. e.g

#!/bin/sh
ssh -t -t rxapp@$1
'if [$? -eq 0 ];
then
echo "SUCCESS"
sudo /etc/init/ntp $2
else
echo "FAIL: Couldnot connect to remote server"
fi'

Here $1 and $2 are given on command line . But this is not getting successful.Script only doing successful ssh but not running sudo and other echo commands. Output : Successful SSH but one exiting it showing following

./jenkins_ucf.sh: line 9: if [$? -eq 0 ];
then
echo "SUCCESS"
sudo /etc/init.d/unifiedCommFwk $2
else
echo "FAIL: COuldnot connect to remote server"
fi: No such file or directory

ANy help please ? or any alternative to it will be helpful too.

Why the single quotes? `if [.......` – Hussain Nov 26 '13 at 14:25 — Hussain, Nov 26 '13 at 14:25

score 5 · Accepted Answer · answered Nov 26 '13 at 14:47

#!/bin/sh
ssh -t -t rxapp@$1 "echo SUCCESS; /etc/init/ntp $2" || echo "FAIL: Could not connect to remote server"

or with if:

if ssh -t -t rxapp@$1 "echo SUCCESS; /etc/init/ntp $2"; then
    echo SUCCESS
else
    echo "FAIL: Could not connect to remote server"
fi

You need to separate the parts that run on the remote server upon successful connection from the parts that run locally when the connection fails.

score 1 · Answer 2 · answered Nov 26 '13 at 14:30

1

You don't need ' ' instead if you are trying to use backticks - that is not required either.

try this :

ssh -t -t rxapp@$1
if [ $? -eq 0 ];
then
echo "SUCCESS"
sudo /etc/init/ntp $2
else
echo "FAIL: Couldnot connect to remote server"
fi

answered Nov 26 '13 at 14:30

cherry2891

215
1
3
13

score 0 · Answer 3 · edited May 23 '17 at 12:30

0

You can execute an if else condition against an SSH server like so:

ssh user@host 'bash -s' <<'ENDSSH'
if [ someCommand ];
then
  echo "SUCCESS"
else
  echo "FAIL"
fi'
ENDSSH

Basically pulled from this answer

edited May 23 '17 at 12:30

Community

1
1

answered Nov 25 '15 at 15:17

Brad Parks

66,836
64
257
336

score -2 · Answer 4 · answered Nov 26 '13 at 14:33

-2

Simply do

ssh host -l username "if yourcommand; then echo Success; else echo Failure;fi"

For example

#!/bin/bash
CMD="if $1; then echo Success; else echo Failure; fi"
ssh host -l user "$CMD"

answered Nov 26 '13 at 14:33

DusteD

1,400
10
14

how to execute if else condition with ssh to remote server

4 Answers4