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Full Discussion: Scheduling a script
Top Forums UNIX for Beginners Questions & Answers Scheduling a script Post 302979769 by Don Cragun on Thursday 18th of August 2016 06:57:23 PM
Old 08-18-2016
You could try something like:
Code:
#!/bin/bash
while [ 1 ]
do	/storage/sas_source/SDTM-Development/FileWatcher/filewatcher.sh &
	wait $! &
	sleep 30
done

Since you chose not to show us your script, we have no idea how many processes it runs nor whether or not it is designed to allow multiple copies of itself to run simultaneously without destroying each other's data. Depending on how many minutes few minutes is and how many processes each invocation of /storage/sas_source/SDTM-Development/FileWatcher/filewatcher.sh starts, you could run out of process table slots allowed for your user ID. And, if the system you're running on has other users that want to do something, a script like the above will be put to sleep to allow other users (or other things you want to run) to run if you become a CPU hog or a disk hog, or a network hog, etc. and some of your sleep 30 commands may take (a little or a lot) more than 30 seconds to complete.

Depending on what operating system you're using and what your script does there may be utilities provided by your operating system that can watch files (individually, in groups, all files in a directory, or all files in a file hierarchy) that will be MUCH more efficient than running 2 * few copies of a process simultaneously.
Last edited by Don Cragun; 08-18-2016 at 07:58 PM.. Reason: Add missing "&" to "wait".
 

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LEARN ABOUT HPUX

serialize

serialize(2)							System Calls Manual						      serialize(2)

NAME

       serialize() - force target process to run serially with other processes

SYNOPSIS

DESCRIPTION

       The  system call is used to force the target process referenced by the pid value passed in to run serially with other processes also marked
       for serialization.  If the value of pid is zero, then the currently running process is marked for serialization.  Once a process  has  been
       marked  by  the	process  stays	marked until process completion, unless is reissued on the serialized process with timeshare set to 1.	If
       timeshare is set to 1, the process specified in pid will be returned to normal timeshare scheduling algorithms.

       This call is used to improve process throughput since process throughput usually increases for large processes when they are executed seri-
       ally  instead  of allowing each program to run for only a short period of time.	By running large processes one at a time, the system makes
       more efficient use of the CPU as well as system memory, since each process does not end up constantly faulting in its working set, to  only
       have  the pages stolen when another process starts running.  As long as there is enough memory in the system, processes marked by behave no
       differently from other processes in the system.	However, once memory becomes tight, processes marked by are run one at	a  time  with  the
       highest	priority  processes being run first.  Each process runs for a finite interval of time before another serialized process is allowed
       to run.

RETURN VALUE

       returns zero upon successful completion, or nonzero if the system call failed.

ERRORS

       If fails, it sets (see errno(2)) to the following value:

	      The	     pid passed in does not exist.

WARNINGS

       The user has no way of forcing an execution order on serialized processes.

AUTHOR

       was developed by HP.

SEE ALSO

       serialize(1), privileges(5).

																      serialize(2)
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