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Full Discussion: Has my script finished?
Top Forums UNIX for Dummies Questions & Answers Has my script finished? Post 20558 by Bab00shka on Monday 29th of April 2002 11:16:03 AM
Old 04-29-2002
Question Has my script finished?

Hi

I'm writing a script which will be run by cron every X minutes.

I don't want cron to run my script again if the previous one has not yet finished.

When the script first runs, I had the idea to store the Process ID in a file. When cron tries to run the script again, I would check the file to see if the previous process ID still existed.

My dilemma is the following:

1. How likely is it that a totally seperate process may have taken the original PID in the file, hence I will be checking the wrong process.

2. Is there any better way to see if my script has finished?

Thanks
Helen Smilie
 

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

NAME
cron - clock daemon SYNOPSIS
auth/cron [-c] DESCRIPTION
Cron executes commands at specified dates and times according to instructions in the files /cron/user/cron. It runs only on an authentica- tion server. Option -c causes cron to create /cron/user and /cron/user/cron for the current user; it can be run from any Plan 9 machine. Blank lines and lines beginning with # in these files are ignored. Entries are lines with fields minute hour day month weekday host command Command is a string, which may contain spaces, that is passed to an rc(1) running on host for execution. The first five fields are integer patterns for minute 0-59 hour 0-23 day of month 1-31 month of year 1-12 day of week 0-6; 0=Sunday The syntax for these patterns is time : '*' | range range : number | number '-' number | range ',' range Each number must be in the appropriate range. Hyphens specify inclusive ranges of valid times; commas specify lists of valid time ranges. To run the job, cron calls host and authenticates remote execution, equivalent to running rx host command (see con(1)). The user's profile is run with $service set to rx. Cron is not a reliable service. It skips commands if it cannot reach host within two minutes, or if the cron daemon is not running at the appropriate time. EXAMPLES
Here is the job that mails system news. % cat /cron/upas/cron # send system news 15 8-17, 21 *** helix /mail/lib/mailnews % SOURCE
/sys/src/cmd/auth/cron.c SEE ALSO
con(1), rc(1) CRON(8)
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