Command to display first few and last few lines of a file
I have a file with many rows, and each row has a timestamp at the starting, like
Unix & Linux
how can I add (subtract, etc.) two numbers with bash?
I can read the numbers and operation in with:
How to inject keystrokes via a shell script?
I’m trying to inject keystrokes into the input daemon so as to simulate typing from a Bash script. Is this possible, and if so, how can I make it happen?
What is the difference between building from source and using an install package?
I was wondering: when installing something, there’s an easy way of double clicking an install executable file, and on the other hand, there is a way of building it from source.
Remapping Caps Lock to Compose
Because I now and then need to use scandinavian letters despite using US Dvorak as my layout, I would like to use Caps Lock as a compose key. (I don’t need Caps Lock at all, I’m not a forum troll)
‘sort’ produces output in a weird order
Consider the following input to sort:
How to terminate a background process?
I have started a wget on remote machine in background using &. Suddenly it stops downloading. I want to terminate its process, then re-run the command. How can I terminate it?
Where are filenames stored on a filesystem?
Where are filenames stored on a filesystem?
When we use mv command, what changes take place in HDD?
Under following conditions-
How to filter IPv4 and IPv6 addresses?
echo "1.1.1.1" | awk '/[0-9]*.[0-9]*.[0-9]*.[0-9]*/ {print $1}' How can I filter IPv4 addresses in a script, and how can I filter IPv6 addresses. I mean more precisely then this so the oneliner should only output VALID IPv4 addresses or another script to output only VALID IPv6 addr. In different languages? like: awk, perl? ty! Answers: … Read more