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Full Discussion: Keep a script on remote machine running (nohup?)
Top Forums Shell Programming and Scripting Keep a script on remote machine running (nohup?) Post 302945086 by oseri on Tuesday 26th of May 2015 06:01:29 AM
Old 05-26-2015
Keep a script on remote machine running (nohup?)
Hi,

I'm using expect to ssh into remote machine (i know its not the best practice), and run script "script.sh".

This "script.sh" checks whether an other process (some another script) is running and if not, it runs it as some other user.

Code:
#!/bin/bash

/usr/bin/expect << EOD
        set timeout 2
        spawn ssh "$user@$host"
        sleep 2
        expect "*assword:"
        send "$passwd\r"
	
        expect ">"
	send "/home/$user/script.sh\r"
        sleep 2
        expect ">"
        send "exit\r"
EOD


Heres the "script.sh"
Code:
#!/bin/bash
        if [ -z "$(pgrep some_process)" ]; then
		echo "some_process not running.. Starting.."
        	echo "passwd" | su - user
        	nohup ./some_process &
		echo "PS : $(ps ax | grep some process)"
                echo "passwd_of_original_user" | su - original_user
		echo "PS : $(ps ax | grep some process)" #some_process is already not running at this line
        else
 		echo "Some_process already running.."
        fi

Now the problem is that the "some_process" should run continuously, yet at the second check of running processes (the line with a comment in code) it is already not running.

From what I googled, the "nohup" command should keep it running even after logging out of the system, but apparently it doesn't.

I dont know what I'm doing wrong, any help will be appreciated
 

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LEARN ABOUT OPENSOLARIS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a    Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.11							    30 Jan 2004 							 script(1)
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