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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LEARN ABOUT XFREE86
suspend
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)