shell script

[David Peacock]

One of my users wants to have 2 cron jobs
running at the same time. She wants to
start a third cron job after both are complete.

How can I make it so the third job will begin
after there is a confirmation that the first
two jobs have completed.

Thank you

[A. Clay Stephenson · Accepted solution]

I can think of 3 methods instantly:

I. Start all 3 jobs simultaneously but have the third job loop with a sleep until two files have been written (by jobs 1 & 2). Job 3 then removes these files and starts processing.

2) 1 cronjob that does this:

job1 &
job2 &
wait
start job 3 processing.

The wait command will wait fore all background processes to complete.

C) You could have job2 issue an at command:
e.g. at /usr/local/bin/myfile.sh at now + 5 minutes.


My preference is 2.

[Hai Nguyen_1]

I'd like A. Clay Stephenson's second method. It is reliable and does simplify the job controlling (all the three jobs are launched from one cron script.)

Hai

[harry d brown jr]

Just create a simple script that is started from cron that starts the first two "jobs" then checks the return status of each before launching the third.

live free or die
harry