bash script to ssh and run commands

Question

I want to ssh to a node and run a command there and then exit. This is repeated for all nods. The script is fairly simple

#!/bin/bash
NODES="compute-0-0 compute-0-1 compute-0-2 compute-0-3"
for i in $NODES
do
   ssh $i
   ls -l /share/apps 
   rpm -ivh /share/apps/file.rpm
   exit
done

But the problem is that, after the ssh, the ls -l command is missed. Therefore, the command prompt waits for an input!

Any way to fix that?

UPDATE:

I modified the loop body as

ssh $i <<END
 ls -l /share/apps
 exit
END

But I get

./lst.sh: line 9: warning: here-document at line 5 delimited by end-of-file (wanted `END')
./lst.sh: line 10: syntax error: unexpected end of file

If you want your ssh section of the script to be indented, use <<-END — Leon
– Leon, Commented Jul 7, 2016 at 7:54
The answer you accepted should work. However, your here-doc approach was not wrong either. I think, you have added some spaces before END after the exit line. Alternately, if you wnt those spaces for indentation, change the heredoc line to ssh $i <<-END (Notice the <<- operator instead of <<) — anishsane
– anishsane, Commented Jul 7, 2016 at 7:54

user6077173 · Accepted Answer · 2016-07-07 07:44:33Z

3

Try this

    #!/bin/bash
    NODES="compute-0-0 compute-0-1 compute-0-2 compute-0-3"
    for i in $NODES
    do
       ssh $i "ls -l /share/apps;rpm -ivh /share/apps/file.rpm;exit;"
    done

answered Jul 7, 2016 at 7:44

user6077173

Sign up to request clarification or add additional context in comments.

1 Comment

Charles Duffy Over a year ago

NODES should be an array, not a string. nodes=( compute-0-{0,1,2,3} ), then for i in "${nodes[@]}"; do -- that way you're not depending on string-splitting on IFS.

Avihoo Mamka · Accepted Answer · 2016-07-07 07:42:51Z

1

I'd change the script and would run the ssh command with the the command to execute.

For example:

#!/bin/bash
NODES="compute-0-0 compute-0-1 compute-0-2 compute-0-3"
for i in $NODES
do
   ssh $i "ls -l /share/apps && rpm -ivh /share/apps/file.rpm && exit"
done

The && operator means that each command will be executed only if the previous command succeeded.

If you want to run the command independently, you can change the && operator to ; instead.

answered Jul 7, 2016 at 7:42

Avihoo Mamka

4,8164 gold badges34 silver badges45 bronze badges

Comments

jonbarlo · Accepted Answer · 2021-09-21 19:01:41Z

1

identation is everything in this type of scripts, one sample bash script for sshing into different servers and exec actions on them:

#!/bin/bash
NODES="[email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected]"
for i in $NODES
do
  echo "SSHing..."
  echo $i
ssh $i << EOF
  cd /home/user/server.com/current/
  bundle exec eye stop all
  echo "Some Process Stopped Successfully!"
EOF

done

answered Sep 21, 2021 at 19:01

jonbarlo

8,1251 gold badge54 silver badges38 bronze badges

Collectives™ on Stack Overflow

bash script to ssh and run commands

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related