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Top Forums Shell Programming and Scripting Strange behavior returning incorrect count Post 302957142 by Corona688 on Wednesday 7th of October 2015 12:02:14 PM
Old 10-07-2015
Quote:
Originally Posted by st11669
Tried it does not work in RHEL 5.
It's not that it "doesn't work". It's that every time you use a | or backticks, you're telling the shell to create new processes.

If you want a way to check if an instance of your process is running without using ps, I suggest a more traditional lock file.
 

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suspend(1)                                                         User Commands                                                        suspend(1)

NAME
suspend - shell built-in function to halt the current shell SYNOPSIS
sh suspend csh suspend ksh suspend DESCRIPTION
sh Stops the execution of the current shell (but not if it is the login shell). csh Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su. ksh Stops the execution of the current shell (but not if it is the login shell). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5) SunOS 5.10 15 Apr 1994 suspend(1)
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