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Full Discussion: linux service script for storing uptime
Homework and Emergencies Homework & Coursework Questions linux service script for storing uptime Post 302480369 by methyl on Tuesday 14th of December 2010 04:41:39 PM
Old 12-14-2010
To run a Shell script as a service.
Code:
nohup /path/scriptname & ; PID=$?
#Don't forget to record the PID in a file because we will need it on shutdown.


Some pointers:

1) Check with your tutor
Is using the unix "uptime" command allowed?

2) How do you stop the process?
Some prefer using a "semaphore" file which when it exists causes the script to remove the file then exit.
Others prefer using a Shell "trap" command and issuing say a "kill -15" to stop the script.
I use both. Sometimes you can't wait for a poll.

3) Here is an example of continuous operation of a Shell script as a Service.
Code:
MYEXIT ()
{
if [ -f /var/tmp/exit_uptime_monitor ]
then
       rm /var/tmp/exit_uptime_monitor
fi
exit
}
#
trap 'MYEXIT' 1 2 3 15
#
#
while true
do
       # Check whether we need to exit
       if [ -f /var/tmp/exit_uptime_monitor ]
       then
              break
       fi
       #
       #
       # Check whether we have been told of a reboot
       # Hint process the "start" parameter if this is a rc script.
       #
       #
       # Do my process here
       #
       #
       sleep 60             # Seconds
done
#
# Clean up and exit
MYEXIT

4) Can your process keep running ?
This is unix. Uptime in months and years is not unusual.

5) If you are using rc scripts
You have a S script to get things started on reboot.
Don't forget to have a K script which issues an appropriate "kill -15"
to get stop the background script quickly.
 

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LEARN ABOUT SUNOS

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 5.10							    30 Jan 2004 							 script(1)
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