Setting up a Daemon in UNIX Post: 302858959

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Top Forums Shell Programming and Scripting Setting up a Daemon in UNIX Post 302858959 by gaugeta on Wednesday 2nd of October 2013 01:56:38 AM

10-02-2013

Registered User

Setting up a Daemon in UNIX

I have scheduled a crontab job in AIX 6.1 OS to run twice in an hour which runs for the whole day to process a load.

The load which crontab kicks off needs files to arrive at a particular directory and if the files arrive, I process them.

It so happens that for the 24 times the crontab kicks off my load there would be only 7 times I actually receive the files and for the rest of the times I receive no files and the load reports saying that no files received and I cannot predict when files arrive as it can arrive anytime.

I heard that a DAEMON can be setup in Unix which can monitor for files arriving at a particular destination and call other scripts after that.

I was thinking if it were possible to create a daemon to monitor a particular destination and if files are present, It can call a shell script.

Is this possible, if yes how can I code the daemon. I have no prior experience with daemons.

Can anyone provide a sample for the same.

gaugeta

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LEARN ABOUT NETBSD

atrun

ATRUN(8)						    BSD System Manager's Manual 						  ATRUN(8)

NAME

     atrun -- run jobs queued for later execution

SYNOPSIS

     atrun [-l load_avg] [-d]

DESCRIPTION

     atrun runs jobs queued by at(1).  Root's crontab(5) must contain the line:

     */10     *       *       *       *       root    /usr/libexec/atrun

     so that atrun(8) gets called every ten minutes.

     At every invocation, every job in lowercase queues whose starting time has passed is started.  A maximum of one batch job (denoted by upper-
     case queues) is started each time atrun is invoked.

OPTIONS

     -l load_avg
	     Specifies a limiting load factor, over which batch jobs should not be run, instead of the compiled-in value of 1.5.

     -d      Debug; print error messages to standard error instead of using syslog(3).

WARNINGS

     For atrun to work, you have to start up a cron(8) daemon.

FILES

     /var/at/spool  Directory containing output spool files
     /var/at/jobs   Directory containing job files

SEE ALSO

     at(1), crontab(1), syslog(3), crontab(5), cron(8)

AUTHORS

     Thomas Koenig <ig25@rz.uni-karlsruhe.de>

BUGS

     The functionality of atrun should be merged into cron(8).

BSD
								  April 12, 1995							       BSD