Redirecting standard error (stderr)

The following command will redirect stderr to a different file than the one stdout is redirected to:

command >log.txt 2>errors.txt;

In case you want to redirect stderr to stdout (&1), and then redirect stdout to a file you can use the following setup:

command >mixed-log.txt 2>&1;

The following command will have the same effect as the previous one, the difference between them is the way they are implemented. This time we will redirect both the stdout and stderr to a file:

command &> mixed-log.txt;

Run Remote Commands with SSH

By adding commands at the end of the ssh command they will be issued at the remote machine and you will get back stdout and stderr results on the local machine. ssh useraccount@boxname 'someCommand | someOtherCommand'

27 September 2011

In "Bash"

Python 3 program that accepts a path to a binary file executes it, captures all output, and kills it once a part of the output matches a pattern or a timeout occurs

import argparse import subprocess import shlex import signal # Function to execute a binary and kill it when a needle is found in its output or after a timeout # Parameters: # binary_path: Path to the binary to execute # binary_parameters: Parameters to pass to the binary # needle: Needle…

12 March 2023

In "Programming"

Bash: After redirected input file is done, allow user to control application via STDIN

Recently, we needed to start an application using a script, which application had its own CLI. After starting it, we had to feed it with some input to configure it before handing it over to the end user. The application we used was named dog. We wrote into a plain…

3 September 2017

In "Bash"

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