Is it possible to run an external process from Perl, capture its stderr, stdout AND the process exit code?

I seem to be able to do combinations of these, e.g. use backticks to get stdout, IPC::Open3 to capture outputs, and system() to get exit codes.

How do you capture stderr, stdout, and the exit code all at once?

How do you capture stderr, stdout, and the exit code all at once, in Perl?

I can run a bash command in node.js like so:

    var sys = require(&#39;sys&#39;)
    var exec = require(&#39;child_process&#39;).exec;
    
    function puts(error, stdout, stderr) { sys.puts(stdout) }
    exec(&quot;ls -la&quot;, function(err, stdout, stderr) {
      console.log(stdout);
    });

How do I get the exit code of that command (`ls -la` in this example)? I&#39;ve tried running

    exec(&quot;ls -la&quot;, function(err, stdout, stderr) {
      exec(&quot;echo $?&quot;, function(err, stdout, stderr) {
        console.log(stdout);
      });
    });

This somehow always returns 0 regardless of the the exit code of the previous command though. What am I missing?

    

Execute bash command in Node.js and get exit code

There&#39;re many exit points in my bash code. I need to do some clean up work on exit, so I used trap to add a callback for exit like this:

    trap &quot;mycleanup&quot; EXIT

The problem is there&#39;re different exit codes, I need to do corresponding cleanup works. Can I get exit code in mycleanup?

How to trap exit code in Bash script

I got a message saying `script xyz.py returned exit code 0`. What does this mean?

What do the exit codes in Python mean? How many are there? Which ones are important?

Exit codes in Python

What&#39;s the difference between `exit(0)` and `exit(1)` in Python?

I tried looking around but didn&#39;t find a specific question on these lines. If it&#39;s already been answered, a link would be sufficient.

Difference between exit(0) and exit(1) in Python

I am running a program and want to see what its return code is (since it returns different codes based on different errors).

I know in Bash I can do this by running

&gt; echo $?

What do I do when using cmd.exe on Windows?

How do I get the application exit code from a Windows command line?

I&#39;m writing a script in Bash to test some code. However, it seems silly to run the tests if compiling the code fails in the first place, in which case I&#39;ll just abort the tests.

Is there a way I can do this without wrapping the entire script inside of a while loop and using breaks? Something like a **dun dun dun** goto?


In a Bash script, how can I exit the entire script if a certain condition occurs?

I have a bunch of system calls in ruby such as the following and I want to check their exit codes simultaneously so that my script exits out if that command fails.

    system(&quot;VBoxManage createvm --name test1&quot;)
    system(&quot;ruby test.rb&quot;)

I want something like

`system(&quot;VBoxManage createvm --name test1&quot;, 0)` &lt;-- where the second parameter checks the exit code and confirms that that system call was successful, and if not, it&#39;ll raise an error or do something of that sort.

Is that possible at all?


I&#39;ve tried something along the lines of this and that didn&#39;t work either.

    system(&quot;ruby test.rb&quot;)
    system(&quot;echo $?&quot;)

or 

    `ruby test.rb`
    exit_code = `echo $?`
    if exit_code != 0
      raise &#39;Exit code is not zero&#39;
    end



ruby system command check exit code

What exactly is a thread exit code in the Output window while debugging? What information it gives me? Is it somehow useful or just an internal stuff which should not bother me?

&lt;!-- language: lang-none --&gt;

    The thread 0x552c has exited with code 259 (0x103).
    The thread 0x4440 has exited with code 0 (0x0).

Is there maybe some sort of list of possible exit codes along with its significance?

What is a thread exit code?

I have a trivial console application in .NET. It&#39;s just a test part of a larger application. I&#39;d like to specify the &quot;exit code&quot; of my console application. How do I do this?


How do I specify the exit code of a console application in .NET?

What would be the best way to check the *exit status* in an `if` statement in order to echo a specific output?

I&#39;m thinking of it being:

```shell
if [ $? -eq 1 ] 
then
    echo &quot;blah blah blah&quot;
fi
```

The issue I am also having is that the `exit` statement is before the `if` statement simply because it has to have that exit code. Also, I know I&#39;m doing something wrong since the exit would obviously exit the program.

How to check the exit status using an &#39;if&#39; statement

I&#39;ve got a PowerShell script as follows

    ##teamcity[progressMessage &#39;Beginning build&#39;]
    # If the build computer is not running the appropriate version of .NET, then the build will not run. Throw an error immediately.
    if( (ls &quot;$env:windir\Microsoft.NET\Framework\v4.0*&quot;) -eq $null ) {
        throw &quot;This project requires .NET 4.0 to compile. Unfortunately .NET 4.0 doesn&#39;t appear to be installed on this machine.&quot;
        ##teamcity[buildStatus status=&#39;FAILURE&#39; ]
    }

    ##teamcity[progressMessage &#39;Setting up variables&#39;]
    # Set up variables for the build script
    $invocation = (Get-Variable MyInvocation).Value
    $directorypath = Split-Path $invocation.MyCommand.Path
    $v4_net_version = (ls &quot;$env:windir\Microsoft.NET\Framework\v4.0*&quot;).Name
    $nl = [Environment]::NewLine

    Copy-Item -LiteralPath &quot;$directorypath\packages\NUnit.2.6.2\lib\nunit.framework.dll&quot; &quot;$directorypath\Pandell.Tests\bin\debug&quot; -Force

    ##teamcity[progressMessage &#39;Using msbuild.exe to build the project&#39;]
    # Build the project using msbuild.exe.
    # Note we&#39;ve already determined that .NET is already installed on this computer.
    cmd /c C:\Windows\Microsoft.NET\Framework\$v4_net_version\msbuild.exe &quot;$directorypath\Pandell.sln&quot; /p:Configuration=Release
    cmd /c C:\Windows\Microsoft.NET\Framework\$v4_net_version\msbuild.exe &quot;$directorypath\Pandell.sln&quot; /p:Configuration=Debug

    # Break if the build throws an error.
    if(! $?) {
        throw &quot;Fatal error, project build failed&quot;
        ##teamcity[buildStatus status=&#39;FAILURE&#39; ]
    }

    ##teamcity[progressMessage &#39;Build Passed&#39;]
    # Good, the build passed
    Write-Host &quot;$nl project build passed.&quot;  -ForegroundColor Green


    ##teamcity[progressMessage &#39;running tests&#39;]
    # Run the tests.
    cmd /c $directorypath\build_tools\nunit\nunit-console.exe $directorypath\Pandell.Tests\bin\debug\Pandell.Tests.dll

    # Break if the tests throw an error.
    if(! $?) {
        throw &quot;Test run failed.&quot;
        ##teamcity[buildStatus status=&#39;FAILURE&#39; ]
    }

    ##teamcity[progressMessage &#39;Tests passed&#39;]

From what I&#39;m lead to believe, [an uncaught `Throw`][1] will result in an exit code of `1`, but unfortunately TeamCity is saying otherwise.

    [19:32:20]Test run failed.
    [19:32:20]At C:\BuildAgent\work\e903de7564e599c8\build.ps1:44 char:2
    [19:32:20]+     throw &quot;Test run failed.&quot;
    [19:32:20]+     ~~~~~~~~~~~~~~~~~~~~~~~~
    [19:32:20]    + CategoryInfo          : OperationStopped: (Test run failed.:String) [],
    [19:32:20]   RuntimeException
    [19:32:20]    + FullyQualifiedErrorId : Test run failed.
    [19:32:20]
    [19:32:20]Process exited with code 0
    [19:32:20]Publishing internal artifacts
    [19:32:20][Publishing internal artifacts] Sending build.finish.properties.gz file
    [19:32:20]Build finished

It might also be important to note that my `Execution Mode` is set to `Execute .ps1 script with &quot;-File&quot; argument`.

I tried changing it to `Put script into PowerShell stdin with &quot;-Command -&quot; arguments`, but then it failed with an exit code of `1` even with passing tests. I&#39;m sure that running it as `-File` is going to be the right way.

If I open up the script located at `C:\BuildAgent\work\e903de7564e599c8\build.ps1` and run it manually in CMD, it does the same thing... I.e., the failing tests fail, and the `%errorlevel%` is still `0`.

Yet, if I run it in PowerShell and call `$LASTEXITCODE`, it returns the right code every time.

 [1]: https://devblogs.microsoft.com/powershell/windows-powershell-exit-codes?Redirected=true



Why are my PowerShell exit codes always &quot;0&quot;?

On the `diff` man-page I&#39;ve found these exit values:

        0     No differences were found. 
        1     Differences were found.
       &gt;1     An error occurred.

Are there different exit values above 1 for different errors?


What are the error exit values for diff?

How do I get a thread to return a tuple or any value of my choice back to the parent in Python?

Return value from thread

I am confused about what error code the command will return when executing a variable assignment plainly and with command substitution:

    a=$(false); echo $?

It outputs `1`, which let me think that variable assignment doesn&#39;t sweep or produce new error code upon the last one. But when I tried this:

    false; a=&quot;&quot;; echo $?

It outputs `0`, obviously this is what `a=&quot;&quot;` returns and it override `1` returned by `false`.

I want to know why this happens, is there any particularity in variable assignment that differs from other normal commands? Or just be cause `a=$(false)` is considered to be a single command and only command substitution part make sense?

**-- UPDATE --**

Thanks everyone, from the answers and comments I got the point &quot;When you assign a variable using command substitution, the exit status is the status of the command.&quot; (by @Barmar), this explanation is excellently clear and easy to understand, but speak doesn&#39;t precise enough for programmers, I want to see the reference of this point from authorities such as TLDP or GNU man page, please help me find it out, thanks again!

Exit code of variable assignment to command substitution in Bash

A process is considered to have completed correctly in Linux if its exit status was 0.

I&#39;ve seen that segmentation faults often result in an exit status of 11, though I don&#39;t know if this is simply the convention where I work (the applications that failed like that have all been internal) or a standard.

Are there standard exit codes for processes in Linux?


Are there any standard exit status codes in Linux?

I have the following error:

&gt; Command /usr/bin/codesign failed with exit code 1

Here is what I already did for trying to fix this:

- set the bundle identifier to com.server.pgmname
- set the code signing to &quot;Any Iphone OS Device&quot;
- set the Code Signing Identity to my Distribution identity.

The error only occurs when I try to build on my device, on the simulator everything works fine.

Do you have any suggestions?

Command /usr/bin/codesign failed with exit code 1

How within a batch file to check if command

    start &quot;&quot; javaw -jar %~p0/example.jar

was successful or produced an error?

I want to use if/else statements to echo this info out.

check if command was successful in a batch file

I&#39;m getting a slew of these messages in my Winforms application even though I never explicitly made any threads. Why is this happening? I&#39;ve looked around for an explanation but it&#39;s hard to word an inquiry like this.

I&#39;m using Visual Studios 2013 and this is the debug output that I&#39;m concerned about:

    The thread 0x23a4 has exited with code 259 (0x103).
    The thread 0x2884 has exited with code 259 (0x103).
    The thread 0x27ec has exited with code 259 (0x103).
    The thread 0x1978 has exited with code 259 (0x103).
    The thread 0x1534 has exited with code 259 (0x103).
    The thread 0x1ad8 has exited with code 259 (0x103).
    The thread 0x2938 has exited with code 259 (0x103).
    The thread 0x22c8 has exited with code 259 (0x103).

All Exit Code Solutions on Gang of Coders

Total of 19 Exit Code Solutions