Advanced Linux Command Trilogy

First of all, ordinary Linux users need to make simple copy, delete, move and so on files or folders. Linux common file operation commands are as follows:

Command	description	example
cd	Toggle directory	cd/mnt
ll	lists all folders and files in the current directory	ll
cp	Copy file or folder	CP -r/tmp/mnt
SCP	remote Copy file	scp-r [email protected" :/tmp/mnt
mv	move a file or folder	mv/tmp/mnt
rm	Delete a file or folder	rm-r/tmp
find	find files or folders	find/ -name tmp
chown	Toggle file User	chown-r pa As:paas *
chmod	Modify file Permissions	chmod 777 test.txt
su	Switch System users	su PAAs

Second, the senior Linux users need to directly on the Linux system for file content viewing, editing and other operations. View files can use head, tail and other commands, modify the file is most commonly used in the VI editor. You can also query the file with the grep command and redirect the query results to a new file by >>.

Head and Tail commands

Command	Description	Example
Head	Display the first 10 lines of the file	Head Test.txt
Head-Number of rows	Display the top n rows of a file	head-100 Test.txt
Tail	10 lines of content after displaying the file	Tail Test.txt
Tail-Number of rows	Displays the contents of the file after n rows	tail-100 Test.txt
Tailf	Real-time display of new additions to files	Tailf Test.txt

VI Editor Common commands

Command	Description	Example
Vi	Opening a file with the VI editor	VI test.sh
Dd	Delete the cursor in the row	VI page, keyboard input DD
/	Inquire	VI page in the keyboard input/, and then enter the query keyword, press ENTER to query
Shift+g	Jumps to the last line of text	VI page Keyboard Press SHIFT+G
I or a	Enter edit mode	VI page Keyboard input I or a, enter the edit mode
：	Enter command line mode	VI page Keyboard input I or a, enter the command line mode
Set number	Add line numbering to text	Command line mode, enter set number
Set line number	Navigate to a row	Command line mode, enter set 123
Q!	Do not save forced exits	command line mode, input q!
qw!	Save and Force exit	command line mode, input qw!
Esc	Exit Current Mode	When the user edits in edit mode, you can exit edit mode by pressing the ESC key

grep Command and redirection

Command	Description	Example
Grep	Search for keywords line by row	grep 123 Test.txt
>>	Append redirect	grep 123 test.txt >> resut.txt
>	Overwrite redirects	grep 123 test.txt > Resut.txt
|	Pipe output	grep 123 Test.txt | GREP ABC

Finally, Linux programmers need to be able to run programs on a Linux system and analyze the running state of the program.

Running Java programs

Command	Description	Example
Javac	Compiling the. java file	Javac Helloworld.java
Java	Run the. class file	Java Helloworld.class
Java-jar	Run the executable jar file	Java-jar HelloWorld

Querying system resources

Command	Description	Example
Top	Display system Run Process information	Top
Free	Display memory Information	Free
Df	Display disk information	Df-h

Network Query

Command	Description	Example
Ifconfig	Querying IP configuration	Ifconfig
Netstat	View network Status	Netstat-anp

Process Query

Command	Description	Example
Ps	Query process	Ps-ef
Jmap	Querying JVM Heap Snapshots	Jmap-heap Process Number

Advanced Linux Command Trilogy