So I wrote a script to run "top", "awk" out values fro the "top" and send the results to a data file.
I then set it to run in cron every 15 minutes.
Now I'm noticing that the script, and it's sub-commands are not always cleanly finishing and, in my investigations, I am also noticing that the script is launching differently than expected from cron. Some of this evidence comes from my ps, which shows processes lingering after completing as shown here:
Note that sometimes the script is launched with the flag "-c", other times not, and once preceded by "/bin/ksh"
The awk and head output are due to commands in the script.
Can anyone suggest why this behavior occurs?
Largely, I am being given a chance to advance, but need to find why these processes are not ending once their run is complete
I don't see the shebang line in your script. My guess is that you forgot to write it, that's why you see
-- bourne shell is invoked as default interpreter.
Please include the shebang line:
at the beginning of the first line and try again
If it still doesn't work as expected, you should tell us whether the script works as it should when you invoke it from command line (with no cron).
First, mirni...
That was my cut and paste error.
The shebang is:
#!/bin/ksh
I just missed it in the cut and paste.
Thanks for pointing that out though!
Marc
---------- Post updated at 11:27 AM ---------- Previous update was at 11:22 AM ----------
Quote:
Originally Posted by RudiC
What caught my eye is top running for 6539 minutes i.e. 4,5 days? I guess the piped processes are not lingering but waiting for top to finish?
Yes, that would be an issue on a production box but we are beta testing the script on a test box as they're only considering allowing me to increase my duties.
What caught my eye is not only the continual run of the top, but the differences in how cron seems to be initiating the script.
Either it with a "sh -c" or it is straight out (as seen in the Feb 21 result)
My first thought is that the top is still running because one of the follow on commands manipulating top's output was encountering an issue. But I realized that would not make sense as top is already done before its output can be piped to the next command.
Then I began wondering if there is something that can gum up the pipe so top can't reach it?
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