Why is sort -o useful?
UNIX philosophy says: do one thing and do it well. Make programs that handle text, because that is a universal interface.
Unix & Linux
How Linux uses /dev/tty and /dev/tty0
I can see the difference between /dev/tty and /dev/tty0 by testing the provided method from this question. But I really wonder about the practical usage of those devices (like situations they will be used).
grep to ignore patterns
I am extracting URLs from a website using cURL as below.
Copy text from one terminal into another
I am logged into ssh to a university account from my home computer. Then I find a file that I want to copy onto my local system. So I open a new shell terminal and am about to use scp to copy that file onto my system. But the path to the file on the system I am ssh‘ed into is long so I select it with the mouse and then paste it with the mouse into the other locally connected terminal.
History of Bash globbing
Is there a historical reason why Bash “globbing” and regular expressions are not identical? For example, I believe that in Bash [1-2]* matches anything that starts with a 1 or a 2 followed by anything else, while as a regular expression [1-2]* would match only a sequence of 1s and 2s. My Bash scripting and REGEX foo are both pretty weak and I regularly run into problems associated with these differences which made me curious was to why they are different.
Compressing two identical folders give different result
I have two identical folders, with same structure and contents like this:
Format output of xargs
I would like to change the format of the output xargs displays
Why doesn’t GNU parallel work with “bash -c”?
% echo -e '1n2' | parallel "bash -c 'echo :$1' '' {}" :1 :2 % echo -e '1n2' | parallel bash -c 'echo :$1' '' {} % I’d expect the second line to act the same. Answers: Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help … Read more
Why/how does “uptime” show CPU load >1?
I have a 1 core CPU installed on my PC. Sometimes, uptime shows load >1. How is this possible and what does this mean?
systemd connect to stdin/stdout after service has started
I have a systemd service that is a console application, meaning that it is controlled by sending commands to its stdin and it outputs information to sdout. How can I set up the systemd service so that I can connect to its stdin and give it commands at any point, then detach from this, and repeat when necessary?