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Full Discussion: Check whether a process is alive or not
Top Forums UNIX for Dummies Questions & Answers Check whether a process is alive or not Post 302119626 by appleforme1415 on Thursday 31st of May 2007 05:33:33 AM
Old 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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LEARN ABOUT X11R4

pidof

PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME

       pidof -- find the process ID of a running program.

SYNOPSIS

       pidof [-s] [-c] [-n] [-x] [-o omitpid[,omitpid..]]  [-o omitpid[,omitpid..]..]  program [program..]

DESCRIPTION

       Pidof  finds  the  process  id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems
       used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts  are  located	in
       /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead.

OPTIONS

       -s     Single shot - this instructs the program to only return one pid.

       -c     Only  return  process ids that are running with the same root directory.	This option is ignored for non-root users, as they will be
	      unable to check the current root directory of processes they do not own.

       -n     Avoid stat(2) system function call on all binaries which are located on network based file systems like NFS.  Instead of using  this
	      option the the variable PIDOF_NETFS may be set and exported.

       -x     Scripts too - this causes the program to also return process id's of shells running the named scripts.

       -o omitpid
	      Tells  pidof  to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro-
	      gram, in other words the calling shell or shell script.

EXIT STATUS

       0      At least one program was found with the requested name.

       1      No program was found with the requested name.

NOTES

       pidof is actually the same program as killall5; the program behaves according to the name under which it is called.

       When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is  possible  that
       it  returns  pids  of  running programs that happen to have the same name as the program you're after but are actually other programs. Note
       that that the executable name of running processes is calculated with readlink(2), so symbolic links to executables will also match.

SEE ALSO

       shutdown(8), init(8), halt(8), reboot(8), killall5(8)

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

								    01 Sep 1998 							  PIDOF(8)
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