Linux terminal and TTY who echo command usage and Shell bash variables

Linux terminal is divided into physical terminal, pseudo terminal, serial terminal, virtual terminal

Physical Terminal:/dev/console

Pseudo terminal (terminal under Remote terminal graphics):/dev/pts/# (digital)

Virtual Terminal:/dev/tty#

Serial Terminal:/dev/ttys#

StartX Start the graphical interface

CTRL + C cancels the command being executed

Shift+pageup/pagedown screen in command screen

TTY command displays current terminal end device files

Who command to view all accounts logged on the current system

Who am I show current terminal login UH account

Shell

GUI: (Windows, Gnome, KDE, XFCE)

CLI: (BSH, CSH, tcsh, ksh, bash, zsh)

Bash:

Administrator prompt: #

Normal user prompt: $

Variable: is a memory space

Echo Echoes

Referencing a variable ${variable name}

Macro:

echo $PS 1

[\[email protected]\h \w]\$

\u: Current User

\h: Host Name

\w: Path base name for working directory

For Linux, the path delimiter:/

Absolute path: The path starting from the top level

Relative path: The path starting at the current position

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Linux terminal and TTY who echo command usage and Shell bash variables