Terner's running terminal commands

Mastering the Grep Command to Show Filename Options: A Complete Guide

Mastering grep: How to Effectively Exclude Anything

Mastering Inverted Matching with grep

[awk] Run and understand Using the trigonometric functions sin and cos

[which] Run and understand Display the path of the command

[whereis] Run and understand Display the path of the executable file and manual

[source] Run and understand. Execute different name with alias

[Shell] Run and understand: Output the default environment variables

[Shell] Run and understand Generate a prompt when logging in to a terminal

[Shell script] Execute and understand; obtain error output from execution results.