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checking for a running process from korn cron

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# 1  
Old 04-30-2005
checking for a running process from korn cron
cron starts a job every 10 minutes via a korn shell - I need to determine if the previous process is still running before I allow the new process to start - HELP
I've tried ps -ef, etc but I have seen many situation where it says that the is running when it is not - any ideas on how to absolutely determine this
HELP
# 2  
Old 04-30-2005
Quote:
Originally Posted by jph
cron starts a job every 10 minutes via a korn shell - I need to determine if the previous process is still running before I allow the new process to start - HELP
I've tried ps -ef, etc but I have seen many situation where it says that the is running when it is not - any ideas on how to absolutely determine this
HELP
if on Solaris, look into 'man fuser'.
# 3  
Old 05-01-2005
Best way to implement this is to use a lock file. When the process starts up, have it look for a lock file (which should be a unique file name). If the file exists, the process can just exit. Otherwise, the process can touch the file and proceed to do its job. Just before exiting the process will remove the file.

Code:
#!/bin/sh
LOCKFILE=/tmp/lockfile # just suppose some name
if [ -f $LOCKFILE ]; then
exit
fi
touch $LOCKFILE  # create your lockfile so that any process starting up after 
                        # will find the file and exit
### start doing what you really want to do here
.
.
.
### end what ever you are doing here
rm -f $LOCKFILE
exit

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