What is the problem exactly? Your script already traps signal 20.
However, exit code 20 is something entirely different than signal 20. Trapping pseudo-signal 0 allows you to perform an action when the script terminates (regardless of the exit code).
If you are expecting "exit 20" to generate the signal, it doesn't work that way. A signal (an interrupt) is something generated by an external event; this is what you can "catch" with the trap keyword. You can generate the signal by hand with kill -s 20 (processid) to trigger the trap. I'm guessing that is not the problem you want to solve in the first place, though, based on your script and your question.
Again, coincidentally, you can set up a trap to handle "signal" 0 (there is no such signal, per se, it's just a special case of trap), however. It will not care what number you use after exit but execute whenever the script exits.
No explicit exit is required, either; the event will trigger when the script simply ends.
I made some stylistic changes to the conditional logic as well.
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1. The problem statement, all variables and given/known data:
That is the last reply I received from my instructor, and I'm looking for some alternatives.
When using... (2 Replies)
Hi
At the beginning of my script, i will create a file and at the end of the script i will delete that.
But i got to delete the file even if the process is forcefully killed, or server is rebooted...
I think i can make use of trap signal, but couldnt figure out how and where to use in my... (4 Replies)
Hi folks,
I have tried to add some trap detection in the below script....this script is used to monitor database activities...in a rather awkward way :rolleyes:....
The idea behind adding trap is that....this script creates lots of temporary files in the running folder to store the count... (1 Reply)
Hi All
"Identify the behavior of traps, mechanism to implement traps in the snmp framework"
What does it mean?? Can anybody explain.. Whats this Trap??
Thanx in Advance. (1 Reply)
Hi
Our problem is knowing:
What is the "best" way of simulating a TRAP for ERR within a function, since we know this will not work directly with ksh93 and aix5. How can we save the error encountered in the function and then deal with it in the calling script?
Thanks! (3 Replies)
Hello all,
I'm hoping to get a little insight from some of the wily veterans amongst you.
I've written a script to check for new outgoing files to our vendors located on our ssl server. It seems to be working ok, but the final question here, will be one of logic, and/or a better way to... (4 Replies)
I'd like to use "trap" command on my unix machine sunOS 5.7.
But somehow when I do "which trap" command, it's no where to be found.
Any one knows how I can get it installed?
Thanks!! (9 Replies)
My problem is this:
I need to have a catch-all for my processes. An example would be, using a trap, in the parent, to catch any non-0 exit or invalid command (a way to catch core dumps would be cool, too) in not only the parent, but it's children and they're children. Not only that, but I also... (7 Replies)