This is the most common way of my sed usage:

echo Good morning | sed 's/\(.*\s\+\).*/\1evening/g'

Here are brief notes on that ..

I’ll step through how to set custom fonts for xterm terminal. My default shell is tcsh.

A hash can be assigned to a key of another hash using hash reference.

If you type echo "Hi\nHow\nHi\nAre\nHi\nYou?\nAre", you will get this in your terminal:

Hi
How
Hi
Are
Hi
You?
Are

Here’s how we can remove the duplicate lines using awk ..

Tiny snippets showing if/else use in awk ..

sed stands for stream editor.

This is the most common way of my sed usage:

echo [SOMETHING] | sed 's/old/NEW/g'

Python snippets to do number representation conversion among binary/decimal/hexadecimal.

This posts explain how the emacs in-built query-replace-regexp command can be used to convert upper-cased strings to lower case.

I have a couple of theme packages installed on my emacs but I would like to assign a default theme.

I set the zenburn theme via a function zenburn. I set the leuven theme via another function leuven. But in my emacs startup I didn’t want to hard-code either of these function and thus arose the need to set a variable to one of these functions.

Some times I would need to define an alias in tcsh which can have optional arguments. tcsh doesn’t seem to support that directly.

Here’s how I solve that problem.