"Linux command line Daquan" series (I, Shell is what)

Learn Linux, starting with the command

The graphical interface just makes simple things simpler

graphical interface can quickly handle simple things, such as opening/closing a file

Then, as transaction complexity increases, the graphical interface is cumbersome to manipulate

For example, insert a picture in Word: Toolbar--insert--picture--Browse directory--OK

This feature is not really complicated, but the whole process, click at least 4 times

and the command line, dedicated to dealing with complex things

Command line in Linux

entering the Linux command line interface, in front of it, is actually a program

its name is, Shell

shell is a program that accepts a command entered by the keyboard and submits it to the Linux operation for execution

shell from the GNU Project Bash,bash is an enhanced version of SH

Linux terminal emulator

linux release, typically with a terminal emulator (terminal emulator), is used to access the shell

The KDE environment uses Konsole, and the GNOME environment uses gnome-terminal

Shell prompt

shell prompt means that the system is ready to accept input

General format:
[user name @ machine name current working directory] $

If $ becomes #, indicates the current operator user Super Administrator privileges

Up or down in command line

up, switch to the command you just executed

down, switch to the next command in the current command (if none, no characters are displayed)

Toggle command, requires that the system has a command history (Linux typically stores up to 500 commands)

Left/Right, move cursor, movable range [command start bit, command end bit]

Simple command

date: Displays today's date and time

cal: Displays the current month calendar

ls: Displays the current directory file list (table Form)

-a Show All files (ls default does not show hidden files-to. The beginning of the file, will generally be hidden)

DF: View the disk drive's current free space

free: Displays available memory information

clear: Clears the executed command (displayed on the interface)

Exit: Exit the terminal emulator

"Linux command line Daquan" series (I, Shell is what)