As a Java developer, there are some common Linux commands that you must master. Even if you don’t use Linux (Unix) or MAC during your development, you need to be familiar with Linux commands. Because many of the servers are Running Linux. So, to interact with the server machine, you need to use shell commands.
This article does not cover all the commands in detail, only common usage and explanations. You can use –help to see help or Google to learn.
1. Search for files
TXT Searches for the filename. TXT file in the/directory by name.
Find.name “*.xml” recursively searches all XML files
. Find -name “*. XML” | xargs grep “hello world” recursive search for all the file content contained in the hello world of XML file
Grep -h ‘spring’ *.xml to find all XML files containing spring
The find. / – size 0 | xargs rm -f & delete the file size is zero
The ls -l | grep ‘jar’ search all the jar files in the current directory
Grep ‘test’ d* Displays all lines that contain test in files beginning with d.
Grep ‘test’ aa bb cc The line matching test is displayed in the AA, bb, and cc files.
Grep ‘[a-z]\{5\}’ aa displays all lines containing strings with at least 5 consecutive lowercase characters per string.
2. Check whether a program is running
Ps – ef | grep tomcat to see all process about tomcat
Ps – ef | grep — color Java highlight to query keyword
3. Terminate the thread
Kill -9 19979 Terminates the process with thread number 19979
4. View files, including hidden files
ls -al
5. Current working directory
pwd
6. Copy files
Cp source dest Copies the file
Cp -r sourceFolder targetFolder Recursively copies the entire folder
SCP sourecFile romoteUserName@remoteIp:remoteAddr Remote copy
7. Create a directory
mkdir newfolder
8. Delete a directory
Rmdir deleteEmptyFolder Deletes an empty directory rm -rf deleteFile Deletes all contents in a directory recursively
9. Move files
mv /temp/movefile /targetFolder
10. Renamed
mv oldNameFile newNameFile
11. Switch to a user
su -username
12. Modify file permissions
Java // File. Java permission -rwxrwxrwx, r means read, w means write, x means executable
13. Compress files
tar -czf test.tar.gz /test1 /test2
14. List the compressed files
tar -tzf test.tar.gz
15. Decompress 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 the log type file
Tail -f exmaple.log // This command automatically displays the new content. The screen only displays 10 lines of content (configurable).
19. Run commands as the super administrator
Sudo rm a.tb Deletes files as an administrator
20. Check whether the port is occupied
Netstat TLN | grep 8080 view port 8080
21. Check which program the port belongs to
lsof -i :8080
22. View the process
Ps aux | grep Java to check the Java process
Ps aux View all processes
23. List the contents of a directory in a tree
tree a
Ps: Run the tree command on the Mac
24. File download
Wget http://file.tgz Install the wget command on the MAC
curl http://file.tgz
25. Network detection
ping www.just-ping.com
26. Remote login
ssh userName@ip
27. Print information
Echo $JAVA_HOME Prints the value of the Java Home environment variable
28. Common Java commands
java javac jps ,jstat ,jmap, jstack
29. Other commands
svn git maven
Linux command Learning website:
explainshell.com/
References:
Error: JBoss port is in use. Please check
The common and powerful commands in Linux are find and grep
Linux command
Welcome to add! ~
