Basic Linux Commands (Unit 1)

stdin

Standard Input - Text stream acting as the default source for command input

stdout

Standard Output - Text stream acting as the default destination for command output

stderr

Standard Error - Text stream used as the default destination for error messages

|

Pipe - Character that passes stdout of one process as stdin to another

> or >>

Redirection - Diverting input or output data to a non-default device or file

tee

CLI command utility used to send output to stdout and a file concurrently

cat

CLI command to concatenate and display file contents

less

CLI command to view text files page-by-page with navigation

touch

CLI command used to create an empty file or update timestamps

tree

CLI command displaying directory structures in a visual tree

shutdown

CLI command used to safely power off or halt the machine

man

CLI command referencing built-in system manuals for help

help

CLI command used to get description and usage of Linux commands

*

Wildcards - Special matching characters used for file and pattern selection

cd

CLI command used to change directories

ls -a

CLI command parameter used to expose dot-prefixed hidden files

recursive

A method in file management where commands operate on a directory and all its subdirectories and files. (usually -r or -R)

-r

A command-line parameter that enables recursive operations, affecting all files and subdirectories within a specified directory.