Hi Abhishek, I checked the mails after a long time so my suggestions are late. Anyways I hope it helps.
===================================================== Dear Friends, I again have a question(looks like i have a lot of questions:) ) I need a shell script run as a cron to do the following task, 1)Do 'ps -ef' or with other arguments of 'ps ' and see whether a particular process is executing. Pl. tell me what are the best parameters of 'ps' to search for a particular process 2) If yes do nothing. 3)If no runs that same process. 4)Logs all messages to a file 5)Logs all error messages to another file. I am a novice at shell script. Pl. help me give some inputs , regarding the best parameters /arguments of 'ps' and whas the method of logging error and normal messages. Thakns, -- Regards, Abhishek Jain ========================================================== In situations like above, I prefer to let cron do the job of launching as scheduled at regular intervals. I would let the script check if any previous instance is running. If there is no previous instance then continue else exit gracefuly echo "Starting script at `date`" if [ -f /var/run/script.lck ]; then echo "Old Lock file found" PID1=`/var/run/script.lck` if [ -z "`ps -ef | grep $PID1 | grep -v grep`" ]; then echo "Looks previous instance exited uncleanly" echo $$ > /var/run/script.lck echo "Starting new instance" else echo "Previous instance already running" exit 1 fi else echo $$ > /var/run/script.lck echo "Starting new instance" fi .... .... and at the end rm -f /var/run/script.lck cron can redirect the output and errors from the script to separate files. Kapil _______________________________________________ ilugd mailinglist -- ilugd@lists.linux-delhi.org http://frodo.hserus.net/mailman/listinfo/ilugd Archives at: http://news.gmane.org/gmane.user-groups.linux.delhi http://www.mail-archive.com/ilugd@lists.linux-delhi.org/
