Linux Basic Command 2

1, modify the network status:

1), cd/etc/sysconfig/network-scripts/network-scripts

2), vi ifcfg-eth0 Editor Onboot=yes;

3), Save exit

4), service network Restart--Restart network

When the network restart fails, select the name of the virtual device (CentOS) Right-click to select "Settings"---network adapter--to NAT mode.

5) Ping baidu.com--ping Network is configured successfully

6) Ifconfig--View IP address: 192.168.243.131

7) In preview mode, enter '/' at the end of the line to enter the keywords you want to search, press ' n ' key to automatically search for the next keyword content.

2, Ps--View the process being executed (PID process number) similar to Task Manager details

1) PS–EF View specific process information

UID--user ID

Pid--Process ID

PPID--ID of the secondary process

C--CPU Use rate

Stime--Start time

Time--Runtime

CMD--Start with what command

3. Kill-Kill Process
Killall--Kill all
kill+ Process number Kill 3024
--For performance test pressurization (Ps,kill)

4,netstat--see how many ports the server has open

1) NETSTAT–ANPT--View port (whether or not the port has been successfully applied)
After killing into town, restart:/opt/zbox/zbox restart
2) Top--View CPU, memory, etc.
CPU (s): us-user CPU
sys-System CPU Utilization
ID--Idle CPU usage
Mem: Memory-K
3) Q – Exit the Task Manager interface directly

5, check the status of the computer

1) DF--View disk utilization

2) Free--View memory usage (in kilobytes)

Swap: Swap space

6. Upload file modification and download

Yum insatll-y Lrzsz--Install Lrzsz upload file

RZ-upload files from the desktop to the Xshell

SZ--Download files to desktop

7. Cursor Movement

1) Move the cursor direction:
?、?、?、? --up, down, left, right
2) Quick jump in line
Jump to the beginning--home or ' ^ ' or the number ' 0 '
Jump to the end of the line--end key or "$" key
3) Quick jump between rows
Jump to the first line of the file--1g or GG
Jump to the end of the file line--g
Jump to line # of the file-#G
4) Line number display
Display line numbers in the editor--:set Nu
Cancels the line number in the editor display--:set Nonu

8. Copy, paste, delete

1) Delete:

Deletes a single character at the cursor--x, Del

Deletes the current cursor line--DD

Delete the # line content starting at the cursor-#dd

Deletes all characters before the current cursor to the beginning of the--d^

Deletes all characters at the end of the line at the current cursor--d$

2) Copy:

Copy the contents of the current entire row to the Clipboard--yy

Copy the # line content starting at the cursor-#yy

3) Paste

Pastes the contents of the buffer at the cursor position after--p

Paste at cursor position before--p

9, File content Search

1) Find the string ' word '--/word from top to bottom in the file

2) Bottom Find the string ' word ' in the file--:word

3) Locate the next matching searched string--n

4) Locate the previous matched string that was found--n

10. Cancel Edit and save exit

1) Press once to cancel the most recent operation--u

2) Press the U key repeatedly to reply to the multi-step operation

3) used to cancel all edits made to the current line--u

4) Save the current file contents and exit the VI editor--ZZ

11. Save file contents and Exit VI Editor

1) Save File--:w

2) Save As other file--:w/root/newfile

3) Not modified exit--:q

4) Discard changes to the contents of the file and Exit VI--:q!

5) Save file Exit VI--:wq

12, File content replacement
1) Replace the first character ' old ' string found in the current line with ' new '--:s/old/new
2) Replace all the string ' old ' found in the current line with ' new '--:s/old/new/g
3) Replace all strings "old" with "new" in the "#,#" range in line, #s/ole/new/g
4) Replace all strings "old" with "new" for the entire file range--:%s/old/new/g
5) with the C command at the end of the replacement command, the user is prompted for each substitution action--:s/old/new/c

13. Rights Management
1) Add User: Useradd user name
2) Set/change user password: passwd password
3) Delete user account: Userdel user name
4) When adding the-r option, it means that the user's host directory is deleted: Userdel–r user name
5) Add group account number: Groupadd Group account name
6) Set the group account password: GPASSWD Group account name
7)-A: Add a user to the group
-D: Delete a user member from within a group
-M: Define a list of group members, separated by commas
8) Groupdel:groupdel Group account name
Example: Useradd st01
Ls-l/home/st01
Userdel-r st01

GROUPADD-G Market
Gpasswd-a Btest Market is adding user "btest" to the "market" group
gpasswd-d Root market is removing the user "root" from the "market" group
Gpasswd-m Btest,root,adm Market
Groupdel Market
9) Permissions and attribution of files/directories
READ: R--4
Write: W--2
Executable: x--1
Owner: The user account that owns the file or directory
Group: An account that owns the file or directory
10) Set file and directory permissions
Chmod nnn file or directory--nnn is a value of (r+w+e)
-R-Recursively modifies permissions for all files and subdirectories in the specified directory
11) Set file, directory attribution
Chown Master file or directory
Chown: A group of files or directories
-R-Recursively modifies permissions for all files and subdirectories in the specified directory

Linux Basic Command 2