Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Getting exit status of child in trap handler
Top Forums Shell Programming and Scripting Getting exit status of child in trap handler Post 302205965 by era on Monday 16th of June 2008 04:04:58 PM
Old 06-16-2008
I don't have ksh to test with, but wouldn't the double quotes cause the $? to be interpolated at the time you declare the trap? I always learned to put traps in single quotes, and quick testing here with bash (Ubuntu Hardy) seems to bear this out.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Over-riding TRAP in Child

Hi, I'm using Ksh on HP 10.2. My parent shell script has ignored INT signal using trap command. trap "" 2 3 .... (other signals) This script calls another script in which INT signal should be active and should not be ignored. I browsed the net and found out that in ksh, once a... (1 Reply)
Discussion started by: anijog
1 Replies

2. UNIX for Advanced & Expert Users

Kill all child processes on trap

hi OS: Sun Solaris I have a scenario that when someone presses ctrl-c while executing a shell script, it should not just exit. it should kill all the child processes started by the running shell script only. I am executing many other scripts parallely which in turn fork off more... (2 Replies)
Discussion started by: rakeshou
2 Replies

3. Programming

Usage of exit() inside a signal handler

Is it ok to use exit() inside a signal handler? I catch SIGUSR1 in a signal handler and I try to close a file and then exit. The result is inconsistent. Sometimes the process exit and sometimes it returns to the original state before the signal handler was invoked. Perhaps exit is not legal in... (8 Replies)
Discussion started by: Tuvia
8 Replies

4. UNIX for Dummies Questions & Answers

Exit from n th child shell

Hi, I am using ksh to write my shell script. I need to create multiple-level of nested sub shells in my script. Lets say I have at n th subshell. My question is how do I come out from there to main login shell. If I use 'exit' command then it is exiting from just one subshell and back to... (4 Replies)
Discussion started by: indra_saha
4 Replies

5. Shell Programming and Scripting

TRAP Command --use based on exit criteria

Hi all, I am using the trap command in my script, and I want it to trap the signal based on the exit code the script returns. can anybody tell me how can I use "if loop" for "trap" command. I want to print "terminated by user" if signal is SIGINT or 2 "failure" if signal is not 2 and not 0... (1 Reply)
Discussion started by: grep_me
1 Replies

6. Programming

Why does my child process not exit?

Im sure it has something to do with the wait() call, but everything ive tried either leaves me with a zombie or with the exec executing indefinitely. switch(pid = fork()) { case -1:perror("fork failed"); exit(1); case 0: if(key == "cd") { execl("/bin/cd", "cd",... (2 Replies)
Discussion started by: p00ndawg
2 Replies

7. Shell Programming and Scripting

Trap not working in orphaned child processes

I've search the various posts in these forums, but have not come up with a solution to my problem. I have a parent process that calls a child script, runs it in the background and the parent finishes - without waiting for the child process to complete. Inside the child, a trap is issued to trap... (6 Replies)
Discussion started by: HobieCoop
6 Replies

8. Shell Programming and Scripting

Track Child process exit

hi, I have a job that spawns multiple child processes in background.. Catch is i want to wait for some jobs to finish before i spawn more background processes. (each job creates a file and deletes at the end of it . so i don't want start new jobs after x amount of disk size is used up) now,... (2 Replies)
Discussion started by: ak_saravanan
2 Replies

9. Shell Programming and Scripting

Kill child processes when exit

Hi, I have parent script which is invoking multiple child scripts. I would want to kill all the child processes before the parent process exit. > cat ./parent #!/bin/ksh while do . ./child arg1 & if ; then break fi done Is there a way to get the process group id for all the child... (3 Replies)
Discussion started by: midhun19
3 Replies

10. Programming

Perl: trap signal 'exit': why I am not able to have it work??

First time trying to work with signals in Perl. Reviewing example I try it, but not able to get it work for 'exit'. I hope, I am correct, assuming, that the ending any code by exit $return_code; the $SIG{EXIT} should be de-referenced and processed?! So, I have such code, that, I assume,... (5 Replies)
Discussion started by: alex_5161
5 Replies

LEARN ABOUT CENTOS

perl::critic::policy::valuesandexpressions::prohibitinterpolatio

Perl::Critic::Policy::ValuesAndExpressions::ProhibitInteUseraContribPerl::Critic::Policy::ValuesAndExpressions::ProhibitInterpolationOfLiterals(3)

NAME

       Perl::Critic::Policy::ValuesAndExpressions::ProhibitInterpolationOfLiterals - Always use single quotes for literal strings.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       Don't use double-quotes or "qq//" if your string doesn't require interpolation.	This saves the interpreter a bit of work and it lets the
       reader know that you really did intend the string to be literal.

	   print "foobar";     #not ok
	   print 'foobar';     #ok
	   print qq/foobar/;   #not ok
	   print q/foobar/;    #ok

	   print "$foobar";    #ok
	   print "foobar
";   #ok
	   print qq/$foobar/;  #ok
	   print qq/foobar
/; #ok

	   print qq{$foobar};  #preferred
	   print qq{foobar
}; #preferred

       Use of double-quotes might be reasonable if the string contains single quote (') characters:

	   print "it's me";    # ok, if configuration flag set

CONFIGURATION

       The types of quoting styles to exempt from this policy can be configured via the "allow" option.  This must be a whitespace-delimited
       combination of some or all of the following styles: "qq{}", "qq()", "qq[]", and "qq//".

       This is useful because some folks have configured their editor to apply special syntax highlighting within certain styles of quotes.  For
       example, you can tweak "vim" to use SQL highlighting for everything that appears within "qq{}" or "qq[]" quotes.  But if those strings are
       literal, Perl::Critic will complain.  To prevent this, put the following in your .perlcriticrc file:

	   [ValuesAndExpressions::ProhibitInterpolationOfLiterals]
	   allow = qq{} qq[]

       The flag "allow_if_string_contains_single_quote" permits double-quoted strings if the string contains a single quote (') character.  It
       defaults to off; to turn it on put the following in your .perlcriticrc file:

	   [ValuesAndExpressions::ProhibitInterpolationOfLiterals]
	   allow_if_string_contains_single_quote = 1

SEE ALSO

       Perl::Critic::Policy::ValuesAndExpressions::RequireInterpolationOfMetachars

AUTHOR

       Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>

COPYRIGHT

       Copyright (c) 2005-2011 Imaginative Software Systems.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  The full text of this license
       can be found in the LICENSE file included with this module.

perl v5.16.3							    Perl::Critic::Policy::ValuesAndExpressions::ProhibitInterpolationOfLiterals(3)
All times are GMT -4. The time now is 11:48 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy