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Running a script on remote server kills my login session

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Top Forums Shell Programming and Scripting Running a script on remote server kills my login session
# 8  
Old 10-12-2016
The problem you have now is that there is no error check that the change of directory worked.

Would running ./test.sh in the home directory cause a problem?

I would avoid the exec, there is just no need and perhaps a script called test.sh is not a great idea given that test is a reserved word.

Why do you feel you need to run your code with at anyway? What's wrong with this?:-
Code:
ssh -l username@hostname 'cd /tmp/$(hostname) && nohup ./test.sh &'

Note the single quotes so that $(hostname) is executed on the target. You can choose to capture the output to a file, leave it to default to nohup.out or redirect it to /dev/null as you please.



Robin
This User Gave Thanks to rbatte1 For This Post:
mbak
# 9  
Old 10-14-2016
Thanks for suggesting to use && which does the error check and I'd change the script name once it is complete as I need to add some more functionality.

The reason I prefer using at over nohup is sometimes ssh tends to not exit after running the remote job if the script that is running receives some input/output values and I do have these values that are called within a script.
# 10  
Old 10-14-2016
All the standard output and errors from a nohuped job will be written to file nohup.out unless you tell it otherwise and by putting the remote script in the background, your ssh will then end. I'm not sure why running with at is more beneficial except that any unhandled output to 'screen' should end up as an email to the user account running the job.

Can you try it and post any unwanted results? If you think your code may pause for input, then you are no worse off.



Robin
# 11  
Old 10-15-2016
I ran using nohup and it works the same way as at except that nohup sends the output to screen as well and I'd like set it up to receive an email only option to the user running the job rather than outputting to the screen.

One more thing I was wondering is how to validate and notify the user if the remote script has actually started running ?

Thanks!
# 12  
Old 10-17-2016
I'd like to pass 1 argument to the below code from a script called mail.sh that runs this code on remote server, any idea how to do it, I tried double quotes but it runs on the local server and also the back slash doesn't work either ?

Code:
cat mail.sh
#!/bin/ksh
if [ "$SERVER" = "" ]
then
   echo "............................"
   echo "Enter server name: \c"
   read SERVER
   echo "Enter MAILID: \c"
   read MAILID
   ssh -l username@$SERVER 'cd /tmp/$(hostname) && nohup ./test.sh \${MAILID}&'
else
  echo "Check your mail for an update"
fi

Last edited by mbak; 10-17-2016 at 03:50 AM..
# 13  
Old 10-17-2016
Quote:
Originally Posted by mbak
I'd like to pass 1 argument to the below code from a script called mail.sh that runs this code on remote server, any idea how to do it, I tried double quotes but it runs on the local server and also the back slash doesn't work either ?

Code:
cat mail.sh
#!/bin/ksh
if [ "$SERVER" = "" ]
then
   echo "............................"
   echo "Enter server name: \c"
   read SERVER
   echo "Enter MAILID: \c"
   read MAILID
   ssh -l username@$SERVER 'cd /tmp/$(hostname) && nohup ./test.sh \${MAILID}&'
else
  echo "Check your mail for an update"
fi

If you want $hostname to be expanded on $server and $MAILID to be expanded locally, try changing:
Code:
   ssh -l username@$SERVER 'cd /tmp/$(hostname) && nohup ./test.sh \${MAILID}&'

to:
Code:
   ssh -l username@$SERVER 'cd /tmp/$(hostname) && nohup ./test.sh'" ${MAILID}&"

# 14  
Old 10-17-2016
Would this do the same?:-
Code:
ssh -l $username@$SERVER "cd /tmp/\$(hostname) && nohup ./test.sh ${MAILID}&"

I think that this should pass the literal text $(hostname) across to be interpreted by the remote system, but the value of S{MAILID}

Some people may prefer this style but I'm prepared to be corrected it is wrong.

It does strike me though that you will get no output/mail if the change of directory fails. Would this be a problem to you? You may be better to both set the directory and test for it within your script and then alert on failure from within there, if appropriate.



Robin
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