Introduction to linux commands (1)

Linux contains commands executed by the administrator root and commands managed by common users: the commands run by Root are put into/sbing and/usr/sbinAllusers and put into/bin and/usr/binLinux. by default, there is a built-in user nobody in the system to add the user: useradd to set the password: passwd...

Linux contains commands executed by the administrator root and commands managed by common users:

Put the commands run by Root in/sbing and/usr/sbin.

All users execute commands in/bin and/usr/bin

 

 

By default, there is a built-in user nobody in Linux.

Add User: useradd

Set password: passwd

Usage: useradd wds

Passwd wds

 

File view file type

 

 

Command:

Ifconfig to view ip information;

Su-user name and password switch user;

 

Command name: ls

Command: list

Command path strength:/bin/ls

Execution permission: all users

Function description: displays directory files.

Syntax: ls option [-ald] [file or directory]

-A: displays all files, including hidden files.

-L detailed information display

-D. View directory properties.

 

 

The information of the file queried by ls-l:

Drwxr-xr-x 2 root 4096 sep 4 13:07 bin

D: indicates the file type. in linux, there are three file types: d File,-executable file, and x soft connection.

R (read) indicates readable, w (write) can be written, and x (execute) can be executed;

U (user) owner g (group) owner group o (other) other

Rwx indicates that the owner has these three permissions.

R-x indicates that the group has two permissions.

R-x indicates the permissions of other users.

2 indicates the number of hardware connections

Root owner

Root group

4096 (inaccurate)

Sep 4 creation or last modification time

Bin file name

 

 

Command name: cd

Command: change directory

Command path strength: shell built-in commands

Execution permission: all users

Function description: switch directories.

Syntax: ls [directory name]

You can use the following commands

 

Command name: pwd

Print working directory

Command path strength:/bin/pwd

Execution permission: all users

Function description: displays the current working directory.

Syntax: pwd

Example: $ pwd

/Etc/rc5.d

 

 

Command name: touch

Command path strength:/bin/touch

Execution permission: all users

Function description: creates an empty file.

Syntax: touch [file name]

Example: $ touch newfile

 

 

 

Command name: mkdir

Make directories

Command path strength:/bin/mkdir

Execution permission: all users

Function description: Creates a directory.

Syntax: mkdir [directory name]

Example: $ mkdir newdiw

 

 

 

Command name: cp

Command syntax: copy

Command path strength:/bin/cp

Execution permission: all users

Function description: copy a file or directory.

Syntax: cp-R [source file or directory] [destination directory]

-R Directory

When copying a directory, you must add-R

 

 

 

Command name: mv

Command: move

Command path strength:/bin/mv

Execution permission: all users

Function description: move and rename a file

Syntax: mv [source file or directory] [destination directory]

Example: $ mv file1 file2 (renamed)

$ Mv file1 dir2 (mobile)

 

 

 

Command name: rm

Command: remove

Command path strength:/bin/rm

Execution permission: all users

Function description: delete an object.

Syntax: rm-r [file or directory]

-R: Delete a directory.

-F: force delete. do not ask if you want to delete

 

Rmdir: delete an empty directory (not applicable. you cannot delete any files in it)

Author "???"