23 Debug Error Line Script
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss debug shell script step by step the workings and policies of this site About Us Learn more about bash set e Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow shell script set -x Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each bash exit on error other. Join them; it only takes a minute: Sign up R script line numbers at error? up vote 48 down vote favorite 21 If I am running a long R script from the command line (R --slave script.R), how can I get it to give line numbers at errors? I don't want to add debug commands to the script
In Shell Script
if at all possible -- I just want R to behave like most other scripting languages ... debugging r share|improve this question asked Sep 18 '09 at 17:47 forkandwait 1,45551519 9 Any updates? Four 4 years later, seems the problem still persists, despite all the mainstream adoption of R. –Gui Ambros Sep 15 '13 at 0:41 add a comment| 3 Answers 3 active oldest votes up vote 24 down vote accepted This won't give you the line number, but it will tell you where the failure happens in the call stack which is very helpful: traceback() I'm not aware of another way to do this without the usual debugging suspects: debug() browser() options(error=recover) [followed by options(error = NULL) to revert it] You might want to look at this related post. [Edit:] Sorry...just saw that you're running this from the command line. In that case I would suggest working with the options(error) functionality. Here's a simple example: options(error = quote({dump.frames(to.file=TRUE); q()})) You can create as elaborate a script as you want on
3, 2012 in Linux, Shell scripting, UNIXRaju asks:
How can I Debug a shell scripts?This is most common question asked by new admins or UNIXBash If
user.Shell scripting debugging can be boring job (read as not easy). bash echo There are various ways to debug a shell script. -x option to debug a shell scriptRun a for loop bash shell script with -x option. $ bash -x script-name
$ bash -x domains.shUse of set builtin commandBash shell offers debugging options which can be turn on or http://stackoverflow.com/questions/1445964/r-script-line-numbers-at-error off using set command.set -x : Display commands and their arguments as they are executed.set -v : Display shell input lines as they are read.You can use above two command in shell script itself:#!/bin/bash clear # turn on debug mode set -x for f in * do file $f done # turn OFF debug mode set +x http://www.cyberciti.biz/tips/debugging-shell-script.html ls # more commandsYou can replace the standard Shebang line: #!/bin/bash with the following (for debugging) code: #!/bin/bash -xvUse of intelligent DEBUG functionFirst, add a special variable called _DEBUG. Set _DEBUG to ‘on' when you need to debug a script: _DEBUG="on"Put the following function at the beginning of the script:function DEBUG() { [ "$_DEBUG" == "on" ] && $@ }Now wherever you need debugging simply use the DEBUG function as follows: DEBUG echo "File is $filename" OR DEBUG set -x
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DEBUG set +x
When done with debugging (and before moving your script to production) set _DEBUG to ‘off'. No need to delete debug lines. _DEBUG="off" # set to anything but not to 'on'Sample script:#!/bin/bash _DEBUG="on" function DEBUG() { [ "$_DEBUG" == "on" ] && $@ } DEBUG echo 'Reading files' for i in * do grep 'something' $i > /dev/null [ $? -eq 0 ] && echo "Found in $i file" done DEBUG set -x a=2 b=3 c=$(( $a + $b )&
Platforms Ask the Core Team Cloud Platform Blogs Hybrid Cloud Microsoft Azure Building Clouds Datacenter Management Hybrid Cloud Operations Management Suite (OMS) System https://blogs.technet.microsoft.com/heyscriptingguy/2015/07/13/tracing-the-execution-of-a-powershell-script/ Center Virtual Machine Manager System Center Service Manager System Center Operations Manager System Center Orchestrator System Center Data Protection Manager Client Management System Center Configuration Manager Configuration Manager Team System Center http://blog.teamtreehouse.com/how-to-debug-in-php Service Manager Malware Protection Center Microsoft Intune Server Update Services Enterprise Mobility Virtualization, VDI & Remote Desktop Virtualization Team Ben Armstrong's Virtualization Remote Desktop Services Ask the Core Team on Hyper-V shell script Enterprise Mobility File & Storage & High Availability File & Storage Ask the Core Team on Failover Cluster Clustering & High Availability Windows Server Management PowerShell Hey Scripting Guy (PowerShell) Networking Identity, Access & Security Datacenter and Private Cloud Security Active Directory Enterprise Mobility Ask Directory Services Hey, Scripting Guy! Blog Learn about Windows PowerShell Tracing the Execution of a PowerShell Script 23 debug error ★★★★★★★★★★★★★★★ July 13, 2015 by The Scripting Guys // 0 Comments 0 0 0 Summary: Ed Wilson, Microsoft Scripting Guy, talks about using a cmdlet to trace the execution of a Windows PowerShell script. Hey, Scripting Guy! I am having a problem with a script. It does not generate any errors, but dude, it does not seem to work either. Can you help me debug it? —DR Hello DR, Microsoft Scripting Guy, Ed Wilson, is here. When I see a script that doesn’t work, I think, "Cool…it is easy to troubleshoot." Often this is the case because the error message helps locate the source of the error. But if a script simply doesn’t work, it can be more difficult to troubleshoot. If the error is a logic error, it can be very difficult to troubleshoot. Most of the time, examining the values of variables does not solve the problem because the code itself works fine. The problem often lies in what are called "the business rules" of the script. These are decisions the code makes that have nothing to do with the correct opera
and found it very interesting, thought it might be something for you. The article is called How to Debug in PHP and is located at http://blog.teamtreehouse.com/how-to-debug-in-php.CaptchaSubmitNobody enjoys the process of debugging their code. If you want to build killer web apps though, it's vital that you understand the process thoroughly. This article breaks down the fundamentals of debugging in PHP, helps you understand PHP's error messages and introduces you to some useful tools to help make the process a little less painful. Doing your Ground Work It is important that you configure PHP correctly and write your code in such a way that it produces meaningful errors at the right time. For example, it is generally good practice to turn on a verbose level of error reporting on your development platform. This probably isn't such a great idea, however, on your production server(s). In a live environment you neither want to confuse a genuine user or give malicious users too much information about the inner-workings of your site. So, with that in mind lets talk about the all too common "I'm getting no error message" issue. This is normally caused by a syntax error on a platform where the developer has not done their ground work properly. First, you should turn display_errors on. This can be done either in your php.ini file or at the head of your code like this: ini_set('display_errors', 'On'); Tip: In these code examples I omit the closing (?>) PHP tag. It is generally considered good practice to do so in files which contain only PHP code in order to avoid accidental injection of white space and the all too common "headers already sent" error. Next, you will need to set an error reporting level. As default PHP 4 and 5 do not show PHP notices which can be important in debugging your code (more on that shortly). Notices are generated by PHP whether they are displayed or not, so deploying code with twenty notices being generated has an impact upon the overhead of your site. So, to ensure notices are displayed, set your error reporting level either in your php.ini or amend your runtime code to look like this: ini_set('display_errors', 'On');
error_reporting(E_ALL); Tip: E_ALL is a constant so don't make the mistake of enclosing