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Full Discussion: Running 3 shell script parallel in another shell script
Top Forums Shell Programming and Scripting Running 3 shell script parallel in another shell script Post 302932494 by sea on Thursday 22nd of January 2015 02:02:05 AM
Old 01-22-2015
Sure, if you let it only execute (set the limit to) one at a time.... it will do a sequence only / as well.

Just to be complete, if one tells the command the limit is 5, it will start t scripts at once in paralell.
And then check every few secs if one or more has ended.
So if 3 had ended, it can start another 3 at once.
If you set the limit to 1000, it could run a thousand scripst in paralell, but still would need to check every few secs, if some had ended and if there are remainings to start.

Its designed to work with more scripts, not just 3, but for some reason, 3 is always the question on the forum.

Also, its not (only) ment to run scripts in background, but also to let you know how they returned.

But guess/seems its an overkill for your needs.
 

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LEARN ABOUT CENTOS

startpar

STARTPAR(8)						      System Manager's Manual						       STARTPAR(8)

NAME

       startpar - start runlevel scripts in parallel

SYNOPSIS

       startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] [-a arg] prg1 prg2 ...
       startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] -M [ boot|start|stop]

DESCRIPTION

       startpar  is  used  to run multiple run-level scripts in parallel.  The degree of parallelism on one CPU can be set with the -p option, the
       default is full parallelism. An argument to all of the scripts can be provided with the -a option.  Processes blocked by pending  I/O  will
       cause  new  process  creation  to be weighted by the iorate factor 800.	To change this factor the option -i can be used to specify another
       value.  The amount weight=(nblockedxiorate)/1000 will be subtracted from the total number  of  processes  which	could  be  started,  where
       nblocked is the number of processes currently blocked by pending I/O.

       The  output  of	each  script is buffered and written when the script exits, so output lines of different scripts won't mix. You can modify
       this behaviour by setting a timeout.

       The timeout set with the -t option is used as buffer timeout. If the output buffer of a script is not empty and the last output was timeout
       seconds ago, startpar will flush the buffer.

       The  -T option timeout works more globally. If no output is printed for more than global_timeout seconds, startpar will flush the buffer of
       the script with the oldest output. Afterwards it will only print output of this script until it is finished.

       The -M option switches startpar into a make(1) like behaviour.  This option takes three different arguments:  boot,  start,  and  stop  for
       reading .depend.boot or .depend.start or .depend.stop respectively in the directory /etc/init.d/.  By scanning the boot and runlevel direc-
       tories in /etc/init.d/ it then executes the appropriate scripts in parallel.

FILES

       /etc/init.d/.depend.boot
       /etc/init.d/.depend.start
       /etc/init.d/.depend.stop

SEE ALSO

       init(8) insserv(8).

COPYRIGHT

       2003,2004 SuSE Linux AG, Nuernberg, Germany.
       2007 SuSE LINUX Products GmbH, Nuernberg, Germany.

AUTHOR

       Michael Schroeder <mls@suse.de>
       Takashi Iwai <tiwai@suse.de>
       Werner Fink <werner@suse.de>

								     Jun 2003							       STARTPAR(8)
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