Linux learning a common Linux command, common directory, VI editor

1. Common Linux directives

Common directives	Function
StartX	Enter the graphical interface
Shutdown-h now	Shutdown
Shutdown-r Now or reboot	Restart
Su-	Switch Administrator
Logout	Cancellation
Ls or Dir	All files in current directory
Ls-l	Current directory all file details
Cd	Switch directories
Pwd	List the current directory path
Useradd XXX	Add User xxx
PASSWD XXX	Change Password to User xxx
Userdel XXX	Delete User xxx
Userdel-r XXX	Delete User xxx (contains directory structure)

2. Linux Common Directory

Common Directory	Describe
/	root directory
/root	Store root user-related files
/home	Storage of common user-related files
/bin	Store command
/sbin	Store commands that require certain permissions
/mnt	Default mount for CD-ROM and floppy drive directories
/boot	Store boot-related files
/etc	Storing configuration-related files
/var	Storage of frequently changing documents
/usr	Default installation path for software

3. Use of the Vi editor

1. Vi Hello.jave
2. I Enter insert mode
3. Input code
4. ESC launches insert mode
5. ：
6. Wq Save and exit
7. Q! Do not save exit
8. Javac Hello.java Compilation
9. Java Hello Run

Linux learning a common Linux command, common directory, VI editor