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Full Discussion: [PHP] endless loop mimics a cron. Make sure only one instance is running
Top Forums Shell Programming and Scripting [PHP] endless loop mimics a cron. Make sure only one instance is running Post 302271246 by jjshell on Wednesday 24th of December 2008 11:00:53 AM
Old 12-24-2008
Thank you very much. Smilie

I'm very new to this, so please excuse a fire of questions.

Quote:
Originally Posted by tderscheid
Your script has a log file, right? Have it write to the log file after it's finished doing whatever it does, and before it sleeps:

Code:
echo 'date' Done - going to sleep >> /tmp/script.sleep.log

I hadn't thought about a log file. But it makes sense. However, since the script executes itself every 30 seconds, 8 hours a day, 5 days a week, I guess I would only log failures (if not, I would end up with a huge log file). What would be your approach?

Quote:
Originally Posted by tderscheid
You can then tail -f the log and watch it roll, check the timestamp on it to see when last updated, figure out when it failed, etc.
The tail command reads and print the final lines of an input. So I would basically read the log file, correct?

Quote:
Originally Posted by tderscheid
I usually count processes by doing something like this:

Code:
ps -aef | grep -v grep | grep very_unique_scriptname | wc -l | bc

Very interesting, even though it will take some serious time for a command newbie like me to translate it into an understandable sentence Smilie
 

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LEARN ABOUT OSF1

strclean

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

NAME

       strclean - Removes outdated STREAMS error log files

SYNOPSIS

       /usr/sbin/strclean [-d logdir] [-a age]

FLAGS

       Specifies  a  maximum  age  in  days for the STREAMS error log files if this not the default age of 3.  The value of age must be an integer
       greater than or less than 3.  Specifies a directory for the location of the STREAMS error log files to  be  removed  if	this  is  not  the
       default directory /var/adm/streams.

DESCRIPTION

       The  strclean  command cleans the STREAMS error logger directory of log files (error.mm-dd) that contain error messages sent by the STREAMS
       log driver (strlog).  If no other directory is specified (the logdir argument), the command removes error log files in the /var/adm/streams
       directory.  If no other age is specified (the age argument), the command removes error log files that have not been modified in 3 days.

       The strclean command is executed by the cron daemon on a periodic basis.

EXAMPLES

       To remove the day-old error log files from a directory called /tmp/streams, enter: strclean -d /tmp/streams -a 1

FILES

       One or more error log file or files on which strclean operates.	The mm.dd in the filename indicates the month and day of the messages con-
       tained in the file.

RELATED INFORMATION

       Commands: strerr(8), cron(8).

       Interfaces: strlog(7).  delim off

																       strclean(8)
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