05-31-2007
Check whether a process is alive or not
Hi Everybody
I have small requirement that needs to be implemented in shell script.
Currently i have shell script which invokes a java process say "Process A" which runs in background.
If some one tries to invoke again the same shell script , then there should be some mechanism inside the shell script to check whether process "Process A"(Background process) is running already or not.If it is already running ,it shud not spawn new process "Process A" again.
On a simple way i can rephrase it as "At any point of time, there should be only one process(background) running which is been invoked by Shell script".If the same shell script is again invoked ,it shud not start the process till it is shutdown.
Another info i need is
Basically i have Process ID of background process which is running currently.
I want to check whether the process that belongs to the process id is alive or not .....
Reply wud be very much appreciated
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shell(1F) FMLI Commands shell(1F)
NAME
shell - run a command using shell
SYNOPSIS
shell command [command] ...
DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise
/usr/bin/sh).
EXAMPLES
Example 1: A sample output of shell command.
Since the Form and Menu Language does not directly support background processing, the shell function can be used instead.
`shell "build prog > /dev/null &"`
If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe-
cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to
save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing.
shell can also be used to execute a command that has the same name as an FMLI built-in function.
NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments
will not be expanded by the shell because "local" means "local to the current process."
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
sh(1), attributes(5)
SunOS 5.10 5 Jul 1990 shell(1F)