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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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doveadm-log

DOVEADM-LOG(1)							      Dovecot							    DOVEADM-LOG(1)

NAME

       doveadm-log - Locate, test or reopen Dovecot's log files

SYNOPSIS

       doveadm [-Dv] log errors [-s min_timestamp]
       doveadm [-Dv] log find [directory]
       doveadm [-Dv] log reopen
       doveadm [-Dv] log test

DESCRIPTION

       The  doveadm  log commands are used to locate and reopen the log files of dovecot(1).  It's also possible to test the configured targets of
       the *log_path settings.

OPTIONS

       Global doveadm(1) options:

       -D     Enables verbosity and debug messages.

       -v     Enables verbosity, including progress counter.

COMMANDS

   log errors
       doveadm log errors [-s min_timestamp]

       The log errors command is used to show the last	- up to 1,000 - errors and warnings.  If no output is generated, no errors  have  occurred
       since the last start.

       -s min_timestamp
	      An  integer  value, representing seconds since the epoch - also known as Unix timestamp.	When a min_timestamp was given, doveadm(1)
	      will only show errors occurred since that point in time.

   log find
       doveadm log find [directory]

       The log find command is used to show the location of the log files, to which dovecot(1) sends its log messages.	 If  dovecot(1)  logs  its
       messages  through  syslogd(8)  and doveadm(1) could not find any log files, you can specify the directory where your syslogd writes its log
       files.

   log reopen
       doveadm log reopen

       This command causes doveadm to reopen all log files, configured in the log_path, info_log_path and debug_log_path settings.  These settings
       are configured in /etc/dovecot/conf.d/10-logging.conf.
       This is for example useful after manually rotating the log files.

   log test
       doveadm log test

       This command causes doveadm to write the message "This is Dovecot's priority log (timestamp)" to the configured log files.  The used prior-
       ities are: debug, info, warning, error and fatal.

EXAMPLE

       This example shows how to locate the log files used by dovecot(1).

       doveadm log find
       Looking for log files from /var/log
       Debug: /var/log/dovecot.debug
       Info: /var/log/mail.log
       Warning: /var/log/mail.log
       Error: /var/log/mail.log
       Fatal: /var/log/mail.log

REPORTING BUGS

       Report bugs, including doveconf -n output, to the Dovecot Mailing List <dovecot@dovecot.org>.  Information about reporting bugs	is  avail-
       able at: http://dovecot.org/bugreport.html

SEE ALSO

       doveadm(1)

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