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Full Discussion: Terminate shell script after a specified time
Top Forums Shell Programming and Scripting Terminate shell script after a specified time Post 302920910 by bakunin on Monday 13th of October 2014 02:07:53 PM
Old 10-13-2014
Quote:
Originally Posted by aydj
Thanks bakunin. For example, if script terminates successfully at 2:30am, and the PID is reassigned to another process before 8am, won't that cause a process to be terminated wrongfully when the second script is run at 8am??
First: it is highly unlikely that the PID is recycled so fastly. PIDs are - for a reason - supposed to be almost random.

Second: even this small chance is further reduced to absolute zero because the terminating script will delete its PID file upon ending. "trap 0" is executed every time the script ends, regardless of how it ends. The action part of the cleanup script will only run when the PID file exists, not when the PID is in use. This means: when the script terminates at 2:30 it will remove the PID file, at 8:00 the cleanup script will start, fail to find a PID script (the "if [ - e file..." will evaluate to "false") and the cleanup script will do nothing (in fact it will issue the warning, see the else-part).

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
aydj
 

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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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