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Top Forums Shell Programming and Scripting Kill shell script when host program not running/disk unmounted Post 302358273 by ripat on Friday 2nd of October 2009 01:34:16 AM
Old 10-02-2009
Quote:
Originally Posted by pcwiz
However this polling wastes resources, so is there a better way to do this?
I wouldn't call this a waste of resources. All it takes is a ps and df commands which are not known as being particularly greedy.

You could maybe better target the .app application by using the -C option if provided by your OS:
Code:
if ps -C firefox-bin ;then
   echo "Firefox running"
fi

Just to make sure that I understand your question correctly: the application you are checking, is that the script itself or an external application?

If it is the very same script you want to check the running status of, you can just use a file as a lock. You create a empty file at the beginning of the script and rm it at the end.
 

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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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