The 'tr' command can be used to ...

# Convert case
echo 'example' | tr '[:lower:]' '[:upper:]'

# Delete characters:
echo 'Hello 123' | tr -d '[:digit:]'

# Squeeze repeated characters:
echo 'hiiiiii' | tr -s 'i'

‘tr’ Command in Linux | String Manipulation Guide (ioflood.com)

@alesya.social I remember a flake.lock file is generated during a build capturing exact versions of inputs used for the build, allows reproduction of the exact environment. Flakes use fixed references to refer to specific versions of dependencies and provide isolation avoiding global state changes.

@alesya.social to flake or not to flake that is my question 😕

Using a 1930 Teletype as a Linux Terminal - YouTube

It works !!

use 'ctrl+r' to search and repeat past commands. Start typing a keyword, and it will find and display matching commands from your history. Saves time and makes navigating the command line easy.

Did you know that the Unix command line has a built-in calculator? You can use the bc command to perform arithmetic operations, such as bc <<< "2+2" or bc <<< "sqrt". You can also use the expr command for simple calculations, such as expr 2 + 2 or expr 25 / 5.