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How to combine PowerShell runspace stderr, stdout etc into a single stream

By : Ryan Chad
Date : September 16 2020, 01:00 AM
I hope this helps . To access output from all streams in output order when using the PowerShell SDK, you'll have to resort to *>&1 as well:
code :
$Instance = [PowerShell]::Create()

# Example commands that write to streams 1-3.
$CommandList = 'Write-Output 1; Write-Error 2; Write-Warning 3'

# Wrap the commands in a script block (`{...}`) and call it using 
# `&`, the call operator, which allows you to apply redirection `*>&1`
$null = $Instance.AddScript('& {' + $CommandList + '} *>&1')

$Result = $Instance.BeginInvoke()
$Instance.EndInvoke($Result) # Returns output merged across all streams.

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How can I log STDOUT and STDERR to a single file and show only STDERR in the console using Ruby?

By : DMike162
Date : March 29 2020, 07:55 AM
hope this fix your issue I can do something like this in bash: , This Ruby script satisfies my needs, but maybe there is a better way.
code :
logPath = ARGV[0]
logFolder = File.dirname(logPath)
command = ARGV.slice(1..-1).join(" ")
`mkdir -p #{logFolder}`
exec "#{command} 2>&1 >> #{logPath} | tee -a #{logPath}"

PowerShell Combine and Log Stderr/Stdout

By : vishnu
Date : March 29 2020, 07:55 AM
To fix the issue you can do How can I mimic this command in PowerShell using Start-Process? , End up going with .NET objects.
code :
$psi = New-Object System.Diagnostics.ProcessStartInfo 
$psi.CreateNoWindow = $true
$psi.RedirectStandardError = $true 
$psi.UseShellExecute = $false 
$psi.FileName = $EXE
$psi.RedirectStandardInput = $true
$psi.WorkingDirectory = $PWD

$process = New-Object System.Diagnostics.Process 
$process.StartInfo = $psi 

    $line = $process.StandardError.ReadLine()
    $line | Tee-Object "my.log" -Append
while (!$process.HasExited)    

$line = $process.StandardError.ReadToEnd()
$line | Tee-Object "my.log" -Append    


How to combine stderr and stdout to single C++ string?

By : user2094011
Date : March 29 2020, 07:55 AM
wish of those help I can grab stdout and stderr separately using fork, execvp, pipe, etc. functions and put them into two separate C++ strings. How can I use this family of functions to combine both stdout and stderr into a single combined string like the shell would as if I am redirecting like "2>&1"? The example below just captures stdout: , Just use one pipe to collect both:
code :
std::string qx(const std::vector<std::string>& args) {
  int output[2];

  const pid_t pid = fork();
  if (!pid) {
    // collect both stdout and stderr to the one pipe
    dup2(output[1], STDOUT_FILENO);
    dup2(output[1], STDERR_FILENO);

    std::vector<char*> vc(args.size() + 1, NULL);
    for (size_t i = 0; i < args.size(); ++i) {
      vc[i] = const_cast<char*>(args[i].c_str());

    execvp(vc[0], &vc[0]);
    // if execvp() fails, we do *not* want to call exit()
    // since that can call exit handlers and flush buffers
    // copied from the parent process


  std::string out;
  const int buf_size = 4096;
  char buffer[buf_size];
  do {
    errno = 0;
    const ssize_t r = read(output[0], buffer, buf_size);
    if (r > 0) {
      out.append(buffer, r);
  } while (errno == EAGAIN || errno == EINTR);

paramiko combine stdout and stderr

By : shaifali jaiswal
Date : March 29 2020, 07:55 AM
wish help you to fix your issue While it is true that set_combine_stderr diverts stderr to the stdout stream, it does so in chaotic order, so you do not get the result you probably want, namely, the lines combined in the order written, as if you were running the command in a local terminal window. Instead, use get_pty. That will cause the server to run the lines through a pseudo-terminal, keeping them in chronological sequence.
Here's a test program, outerr.py, that writes alternating lines on stdout and stdin. Assume it's sitting in the home directory of llmps@meerkat2.

bash: How to prepend a string to stderr lines and combine both stdout and stderr in exact order and store in one variabl

By : Muhammad Shakir
Date : March 29 2020, 07:55 AM
I hope this helps you . The sed command runs asynchronously from the rest of the shell; its output goes to standard error as soon as it processes its input from the commands in the command substitution. The standard output of those commands, however, are captured in $var and not displayed until the echo command runs.
Even if you weren't capturing the output, there is a chance the standard error and standard output of those commands wouldn't appear as you expect, because the sed command that ultimately produces the error messages might not be scheduled by the OS when you expect it to be, delaying the appearance of the error messages.
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