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The content of this article mainly focuses on the necessary Linux commands for Java programmers. The content of the article is clear and clear. It is very suitable for beginners to learn and is worth reading. Interested friends can follow the editor to read together. I hope you can get something through this article!

Java programmers do not use the Linux system when developing, but interact with the server using shell, so java programmers should also master Linux commands.

1. Find a file

Find /-name filename.txt looks for the filename.txt file in the / directory by name.

Find. -name "* .xml" recursively finds all xml files

Find. -name "* .xml" | xargs grep "hello world" recursively finds all xml files containing hello world in their contents

Grep-H 'spring' *. Xml to find some xml files that contain spring

Find. /-size 0 | xargs rm-f & Deletes files with zero file size

Ls-l | grep '.jar' to find all jar files in the current directory

Grep 'test' d * displays lines that contain test in all files that begin with d.

Grep 'test' aa bb cc displays lines that match test in the aa,bb,cc file.

Grep'[a Murz]\ {5\}'aa displays all lines that contain at least five consecutive lowercase characters for each string.

two。 Check whether a program is running

Ps-ef | grep tomcat to view all processes related to tomcat

3. Terminating thread

Kill-9 19979 terminates a process with thread number 19979

4. View files, including hidden files

Ls-al

5. Current working directory

Pwd

6. Copy a file

Cp source dest copy Fil

Cp-r sourceFolder targetFolder recursively copies the entire folder

Scp sourecFile romoteUserName@remoteIp:remoteAddr remote copy

7. Create a directory

Mkdir newfolder

8. Delete directory

Rmdir deleteEmptyFolder delete empty directory

Rm-rf deleteFile recursively deletes everything in the directory

9. Move Fil

Mv / temp/movefile / targetFolder

10. Rename

Mv oldNameFile newNameFile

11. Switch users

Su-username

twelve。 Modify file permissions

Permissions for chmod 777 file.java file.java-rwxrwxrwx,r for read, w for write, x for executable

13. Compressed file

Tar-czf test.tar.gz / test1 / test2

14. List the compressed files

Tar-tzf test.tar.gz

15. Extract the file

Tar-xvzf test.tar.gz

16. View the first 10 lines of the file

Head-n 10 example.txt

17. View the last 10 lines of the file

Tail-n 10 example.txt

18. View log type files

Tail-f exmaple.log this command will automatically display the new content, the screen only displays 10 lines of content (configurable).

19. Execute commands using the Super Admin identity

Sudo rm a.txt uses the administrator identity to delete files

20. View port occupancy

Netstat-tln | grep 8080 to view the usage of port 8080

21. Check which program the port belongs to

Lsof-I: 8080

twenty-two。 View the process

Ps aux | grep java to view java processes

Ps aux to view all processes

23. List the contents of the directory in a tree view

Tree a

24. File download

Wget http://file.tgz

Curl http://file.tgz

25. Network detection

Ping www.just-ping.com

twenty-six。 Remote login

Ssh userName@ip

twenty-seven。 Print information

Echo $JAVA_HOME prints the value of the java home environment variable

28.java common commands

Java javac jps, jstat, jmap, jstack

What are the collection classes in Java? the sets in Java are mainly divided into four categories: 1, List list: ordered, repeatable; 2, Queue queue: ordered, repeatable; 3, Set collection: non-repeatable; 4, Map mapping: disorder, key unique, value is not unique.

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