Linked Questions

Various bash commands I use -- fancy diffs, build scripts, etc, produce lots of color output. When I redirect this output to a file, and then cat or less the file later, the colorization is gone -- ...

Whenever I use grep, and I pipe it to an other program, the --color option is not respected. I know I could use --color=always, but It also comes up with some other commands that I would like to get ...

I tried to pass username and password to the command '/opt/splunk/bin/splunk reload deploy-server' but its throwing "stdin appears to be a pipe" error , help me in fixing this error. [splunk@ip-10-15-...

Let's do a simple example. This is what the standard output was printed on screen by Terminal. Mac:~ usr$ brew list gdbm libidn2 node python@2 wget gettext ...

We have a third-party Java application that uses System.console().readPassword() method. It cannot be modified. We need to call it from a non-interactive shell script that should pass password to that ...

Consider the following zsh script: echo $(echo "yes") Now, echo takes a string and turns it into standard output. On the other hand, the $(X) notation evaluates X and turns its standard ...

How do I call shell commands from inside of a Ruby program? How do I then get output from these commands back into Ruby?

What is the difference between the following Ruby methods? exec, system and %x() or Backticks I know they are used to execute terminal commands programmatically via Ruby, but I'd like to know why ...

When I execute "python" from the terminal with no arguments it brings up the Python interactive shell. When I execute "cat | python" from the terminal it doesn't launch the interactive mode. Somehow, ...

1. `` The Backtick defined in Kernel 1. a) %x{} Percent X < alternate syntax for The Backtick defined in parse.y, see discussion 2. system() Kernel#system 3. fork() Kernel#fork, Process#fork ...

Basically I'm wondering why this doesn't output anything: tail --follow=name file.txt | grep something | grep something_else You can assume that it should produce output I have run another line to ...

Certain commands produce text in color for readability. I'm using Linux. For example when I'm using rak or hg diff the output is in color for better readability. However when I pipe the output ...

I've got a script like: #!/bin/bash exec /usr/bin/some_binary > /tmp/my.log 2>&1 Problem is that some_binary sends all of its logging to stdout, and buffering makes it so that I only see ...

Consider the following C program (test.c): #include <stdio.h> int main() { printf("string out 1\n"); fprintf(stderr, "string err 1\n"); getchar(); printf("string out 2\n"); fprintf(...

A python script is controlling an external application on Linux, passing in input via a pipe to the external applications stdin, and reading output via a pipe from the external applications stdout. ...