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Signal Trap Not Working

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Pretty straight forward; however, when I put a "sleep 5" in the while loop and run the script, then press CTRL c, no message is echoed to the screen. What should I pack for an overland journey in a Bronze Age? Consider the following program: #!/bin/bash echo "this script will endlessly loop until you stop it" while true; do : # Do nothing done After you launch this script it will appear Please enable JavaScript to view the comments powered by Disqus. http://vidivit.com/not-working/signal-lights-not-working-on-trailer.html

Any idea why? Join them; it only takes a minute: Sign up why is this simple bash trap failing up vote 3 down vote favorite I'm still pretty new to bash scripting, and I'm end # stuff with foo end krader1961 added the enhancement label Mar 18, 2016 The user-friendly shell member krader1961 commented Mar 18, 2016 @maxnordlund: There is no --on-function-return option for the For a complete list, type "trap -l". http://unix.stackexchange.com/questions/282525/why-did-my-trap-not-trigger

Bash Trap Exit Not Working

Control-C sends SIGINT to every process in the foreground process group. Magnetic effect on AC circuits? Because that definitely will not work.

In the case of an interactive shell, this terminates the loop. If a sigspec is ERR, the command arg is executed whenever a simple command has a non-zero exit status, subject to the following condi‐ tions. Does that help? Here is my code, I use it to tail log on the remote machines #!/bin/bash # tailx error.log hostname function tailx { [ $# -lt 2 ] && echo "Invalid input"

Signal.trap(0, proc { puts "Terminating: #{$$}" }) Signal.trap("CLD") { puts "Child died" } fork && Process.wait produces: Terminating: 27461 Child died Terminating: 27460 static VALUE sig_trap(int argc, VALUE *argv) { int Bash Trap Exit Code If a sigspec is DEBUG, the command arg is executed before every simple command, for command, case command, select com‐ mand, every arithmetic for command, and before the first command executes It works in RHEL.. Linux is a registered trademark of Linus Torvalds.

This naturally leads to some security concerns. I'm not sure it rises to the level of 'bug'; I'd have to read a lot of manual rather carefully (probably several times) and consult with other knowledgeable people before claiming ctrl/c only "works" on the parent when the parent is running an actual bash command like some kind of loop. The example from man trap is trap 'status --print-stack-trace' SIGUSR1 and this spews some nonsense.

Bash Trap Exit Code

R: regex for math expression Storing passwords in access-restricted Google spreadsheets? https://ruby-doc.org/core-2.2.0/Signal.html It traps SIGINT in order to display a summary at the end, before exiting. Bash Trap Exit Not Working The simplest signal handling a process can choose to perform is to ignore a signal. share|improve this answer answered Oct 3 '14 at 12:08 Aaron Digulla 205k60368577 Yes, thanks for your reply and you are right.

I'd recommend opening an enhancement issue as I couldn't find an open issue asking for such a feature and it's orthogonal to this issue. Is this a potential security threat? A good file name will help you figure out what wrote the file, but will not be entirely predictable. Though this is not relevant to Bash only, it's specified by POSIX too: see Section 2.11 Signals in the POSIX specs‌​.

Join them; it only takes a minute: Sign up trap not working in shell script? All Rights Reserved. UNIX is a registered trademark of The Open Group. when I interrupted, as you expected.

It is analagous to running the Code: ls command on a huge directory. Quote: [email protected]:~/work/shellscript$ trap 'foo \$LINENO' ERR [email protected]:~/work/shellscript$ echo $? 0 [email protected]:~/work/shellscript$ bash --version GNU bash, version 4.1.5(1)-release (i686-pc-linux-gnu) Copyright (C) 2009 Free Software Foundation, Inc. Please be thorough in your response, so I can understand what's going on.

Getting "Current Sitecore database cannot be established" using Sitecore Powershell Extensions Can a check with has_key(d, k) and an immediate assignment be short circuited in vim script?

Sadly, this only seems to work in Bash. Not the answer you're looking for? This is generally a bad idea, unless it is done for a very specific purpose. Not the answer you're looking for?

AFAIK all shells work this way. What should I do about this security issue? Previous | Contents | Top | Next © 2000-2016, William E. Hotels on the Las Vegas strip: is there a commitment to gamble?

Introduction to Linux - A Hands on Guide This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started I'm not sure it will be any consolation, but I tried ksh on your script with . Browse other questions tagged shell signals trap or ask your own question. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the

Shotts, Jr. Unix & Linux Stack Exchange works best with JavaScript enabled current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. Does that help?