Linux Common commands

a the format of the Linux command

1 , Commands [ options ] [ parameters ]

ls List Display the contents of the directory

① Command name: ls

Command English Original: List

Command path: /bin/ls

Execute Permissions: All Users

function Description: Display directory file ② ls name Direct Enter to display the contents of the directory

ls-l Long format display ( the thumbnail option with a minus sign, the full option with two minus )

-RW-------1 root root 1190 08-10 23:37 anaconda-ks.cfg

First item: Permission Bits

the second item: 1 Reference Count

the third item: Root owner

Item Fourth: Root Genus Group

Item Fifth: Size

Item Sixth Last modification Time

Item Seventh file name

ls-a Show All files (contain hidden files)

Ls-al

ls-h file size is displayed as a common size unit B KB MB

ls-d display the directory itself, not the child files inside

ls-l file name

Prompt:

[email protected]localhost src]#

[Current login user @ hostname current directory]#

# Super User

$ Normal User

Current directory: ~ User Home Directory

Administrator /root

Normal User /home/User Name

two Directory Operations Command

1 ) CD change the directory in which

① Command name: CD

Command English Original: Change directory

Command path: Shell built-in commands

Execute permissions: All users ② cd/usr/local/src

relative path: Look for the current directory. Be sure to first determine the current directory. Root] #cd. /USR/LOCAL/SRC

Absolute Path: cd/usr/local/src starting from the root directory, first-level recursive lookups. In any directory, access to the specified location cd ~ Enter the current user's home directory /root/home/aa/

CD CD- go to last directory

CD.. go to the top level directory CD. go to current directory

2) pwd Show current directory

Command name: pwd

Command English original intention : Print working directory

Command path: /bin/pwd

Execute Permissions: All Users

3 ) Linux Common Directories

/ root directory

/bin command to save the directory (commands that ordinary users can read)

/ Boot start directory, start related files

/ Dev device File Save directory

/ etc configuration File Save Directory

home directory for normal users

/lib System Library Save directory

/mnt System mount Directory

/media Mount Directory

/root home directory for super users

/ tmp Temp directory

/sbin command to save directory (a directory that superuser can use)

/proc write directly to the memory

/sys

/ usr system software Resources Directory

/usr/bin/ system command (normal user)

/usr/sbin/ system command (super User)

/ var system-related document content

/var/log/ System log Location

/var/spool/mail/ system default mailbox Location

/var/lib/mysql/ default installed MySQL library files directory

4 ) Create a directory

mkdir Directory name

Command name: mkdir

Command English Original: Make directories

Command path: /bin/mkdir

Execute Permissions: All Users

mkdir-p 11/22/33/44 Recursive build directory

5 ) Delete directory

rmdir Catalogue only empty directories can be deleted

Command name: rmdir

Command English Original: Remove Empty Directories

Command path: /bin/rmdir

Execute Permissions: All Users

RM file name Deleting Files

RM-RF Catalogue Delete files and directories

- R recursive, deleting directories

- F forcing

6 ) Tree Directory name Displays the directory tree for all content under the specified directory

Command name: Tree

Command path: /usr/bin/tree

Execute Permissions: All Users

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Linux Common commands