$stdout is a global variable that represents the current standard output. STDOUT is a constant representing standard output and is typically the default value of $stdout. With STDOUT being a constant, you shouldn’t re-define it, however, you can re-define $stdout without errors/warnings (re-defining STDOUT will raise a warning). for example, you can do: $stdout = … Read more
The solution you suggest is a good one: create your processes manually such that you have explicit access to their stdout/stderr file handles. You can then create a socket to communicate with the sub-process and use multiprocessing.connection over that socket (multiprocessing.Pipe creates the same type of connection object, so this should give you all the … Read more
Try this: script -q -c ‘module help null’ /dev/null > aaa.txt This works in a shell script (non-interactively) using $ script –version script (util-linux-ng 2.16) You may also be able to use expect. Also see: Catching a direct redirect to /dev/tty.
Typically, System.out is a buffered output stream, so text is accumulated before it is flushed to the destination location. This can dramatically improve performance in applications that print large amounts of text, since it minimizes the number of expensive system calls that have to be made. However, it means that text is not always displayed … Read more
Your symptom implies that $ErrorActionPreference=”Stop” is in effect at the time function Test-Validation executes. (Temporarily) set it to ‘Continue’ to fix your problem – which in future versions will hopefully no longer required (see below). The reason for the observed behavior is that, in Windows PowerShell and up to PowerShell (Coe) 7.1, using an error-stream … Read more
You are making couple mistakes in your example: 1) you have to call curl_exec() prior to reading from the “verbose log”, because curl_setopt() doesn’t perform any action, so nothing can be logged prior to the curl_exec(). 2) you are opening $curl_log = fopen(“curl.txt”, ‘w’); only for write, so nothing could be read, even after you … Read more
From within a Ruby script, you can redirect stdout and stderr with the IO#reopen method. # a.rb $stdout.reopen(“out.txt”, “w”) $stderr.reopen(“err.txt”, “w”) puts ‘normal output’ warn ‘something to stderr’ $ ls a.rb $ ruby a.rb $ ls a.rb err.txt out.txt $ cat err.txt something to stderr $ cat out.txt normal output
Do you need to do anything with the output of the process? The check_call method might be useful here. See the python docs here: https://docs.python.org/2/library/subprocess.html#subprocess.check_call You can then use this as follows: try: subprocess.check_call(command) except subprocess.CalledProcessError: # There was an error – command exited with non-zero code However, this relies on command returning an exit … Read more
In Ruby, $stderr refers to the output stream that is currently used as stderr, whereas STDERR is the default stderr stream. It is easy to temporarily assign a different output stream to $stderr. require “stringio” def capture_stderr # The output stream must be an IO-like object. In this case we capture it in # an … Read more