CentOS7 Basic Command Summary

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CentOS7 First, introduce

The double plate of Red Hat

Ii. Tools Needed

CentOS7 CD image file

-everything (full version)

SECURECRT Remote Landing terminal software

WinSCP Linux and window transfer tools

Iii. Common operation commands

Ifconfig	View IP Address
Init 3	Toggle Command mode
Init 5	Toggle Graphical Interface

Pwd	View the current directory
Touch A.C	New File A.C
Ls	View files and folders in the current directory
Ls/tmp	View files and folders under the TMP folder in the current directory
RM A.C	Deletes the file a.c in the current directory of the file (prompts for deletion)
RM A.C-RF	Permanently delete (do not prompt for deletion)
MKDIR ABC	New Catalog ABC
CP anaconda-ks.cfg/tmp	Copy file [Anaconda-ks.cfg] to the current directory TMP folder
Cat Anoconda.log	View the contents of the file [Anoconda.log]
VI Anoconda.log	Open the file [Anoconda.log] content with the editor
Vim Anoconda.log	Open the file [Anoconda.log] content with the editor

Iv. Specific Operations 1. How to modify the IP address.

2. User-related Operations

Add user	USERADD ABC add user ABC
View User	Vipw
Jump last line	Capital D
Add a group	Groupadd CCNA Add Group CCNA
View Group	Vigr
Skip to last line	Capital D
View the groups to which the user belongs	Groups ABC View group of ABC users
View Current User is	WhoAmI
Exit	Exit
Specify a user to a group	GPASSWD-A ABC CCNA Set user-owned group to CCNA
Delete User	Userdel ABC Delete User ABC
Delete a group	Groupdel CCNA Delete Group CCNA
View User IDs	ID ABC view the ID value of user ABC (the smaller the ID value, the greater the general permissions)
Toggle User	SU-ABC switch Current user to ABC

File Permissions Related
Permissions	R Readable W writable x executable
Permission Correspondence encoding	4==r 2==w 1==x
Extended	6==RW (Readable and writable) 3==WX (writable executable) 5=rx (Readable executable)
Create a file	Touch A.C Create File A.C
View information about a file (Permissions, creator, creation time, etc.) for the file by the current user	ll
Permissions to modify Files	chmod 777 A.C Modify file A.C permissions for-rwxrwxrwx chmod 643 a.c Modify file A.C permissions for-rw-r---WX
Add File Permissions	chmod +x a.c Add executable permissions to file A.C

problem

Problems with virtual machine Ubuntu connection using WINSCP ...

Ifconfig problem.

Final issue: No SSH service, need to download the installation SSH service package

To see if there is an SSH Service command: Service SSH--status

2017/7/11, 8:24 3. Toggle file-Owning user and group

New File A.C	Touch A.C
View file information	ll

Chown Root A.C	The user of the specified file is root
CHGRP CCNP A.C	The specified file corresponds to a user group of CCNP

The following are abbreviated:

Chown ABC.CCNP A.C	Specifies that the owning user of the file A.C is ABC, and the owning user group is CCNP
Chown Root.root A.C	Specifies that the owning user of the file a.c is root and the owning user group is root

Useradd YP1

Useradd YP2

Useradd YP3

Mkdir/tmp/test

Cd/tmp/test

Chown YP1.YP2 ABC-RF

Add the owning user and the owning user group to the folder ABC, force all files and folders in the folder to add the owning user and the owning user group

4. Process-related

Ps-ef	View all processes (including system processes)
Ps-ef |more	Paging View all processes (including system processes)
Ps-ef |grep Firewalld	View FIREWALLD related processes
Which FIREWALLD	FIREWALLD Directory
Kill 970	Ending process with process ID 970
Kill-9 970	Force shutdown process with process ID 970
Jobs	viewing processes (without system processes)
Kill-stop 80477	Pause process with process ID 80477
Kill 80477	Shut down process with process ID 80477

5. Network-related

SCP index.html Root@192.168.80.100:/root	Send the file as user root index.html to the root directory of the 192.168.80.100 server
Hostname	View current host Name
Hostname abc.com	Modify the current host name to ABC.com
Ping www.baidu.com	View IP for Domain name
Nslookup www.baodu.com	View IP for Domain name
SSH 192.168.80.100	Log on to the 192.168.80.100 server
Ifconfig	View IP Address
Route	View routing Information
wget http://www.baidu.com/index.html	Download File http://www.baidu.com/index.html

6. System-related

Shutdown	Shutdown
Shutdown-r	Reboot
Shutdown-h now	Shutdown
Shutdown-h 20:00	Timed shutdown