Lesson6--linux command Explanation

First group: User management

1. Add user Useradd [] User name

   After adding a user, the user folder is automatically generated at/home

2. Delete User Useradl [-r] User name

   When the user is deleted, the/home user folder is automatically deleted through the [-r] Option

3. Modify user password passwd [] User name

4. Add user group Groupadd [] User group

5. Switch User Su-user name

   If the [-] option is selected, switch the environment variables together

6. Delete user group Groupdel user group name

Second group: File and Directory class commands

2. View Catalog ls or ls/home/

   Show hidden files Ls-a/home/

   Show more info ll or ll-la/home/

4. Change the working directory CD directory name

   Cd..

   Cd.. /..

   Return to previous catalog CD-

6. Copy files/directories CP [] source file Destination file

   Cp[-r] Original Folder destination folder

8. Move/Rename Mv/home/test/home/test_01

   Mv/home/test/temp

10. Delete File/directory RM [] File name

    RM [-R] Folder

    Force delete RM [-f] File name

12. Change file access permissions such as:

    chmod u+w hello.c

    chmod g+r test.c

    chmod 777 TEST.c

14. Create directory mkdir [] directory name

    For example, with the [-p] option, Mkdir-p/home/dir1/dir2/dir3. () if Dir1 and dir2 do not exist, they will be created automatically.

16. View Directory Size Du/tmp

18. View current path pwd

Group Three: Compressed packaging class commands

1. Compress extract gzip [] File name

   Example: gzip/home/test.c compressed, the source file hours

   gzip-d/home/test.c Extract a file

2. Compression decompression bZIP [] File name

   Example: bzip/home/test.c compression

   bzip-d/home/test.c Decompression

3. tar [] Directory/File

   For example: Tar cvf temp.tar/tmp

   Tar xvf Temp.tar

   Tar cvzf temp.tar.gz/temp @temp as source file

   Tar xvzf temp.tar.gz

Group Fourth: Disk Management class Commands

1. Loading the disc mount/dev/cdrom/mnt

2. Unmount the disc umount/mnt

3. View Disk DF []

4. Create a file Touch file name

5. File Link ln file name

   For example: Create a soft connection ln-s/home/old_file/slink

   Wear a hard link ln/home/old_file/hlink

Group Fifth: Find class commands

1. Find files/directories find [] files/directories

   Example: find/root/-name Install.log

2. Find string grep "string" path []

   For example: grep "Hello"./-rn @ list Results

   grep "xml"/root-rn

Group Sixth: Process commands

1. View process: PS aux

2. Kill process: Kill [Process number]

3. View Memory: Free

4. CPU Share: Top

Group Seventh: Other Commands

1. Software management rpm [IVH] File name

   (RPM packages are generally included in the package directory of the system CD-ROM)

   View installed software: RPM-QA

   Uninstalling installed software: RPM-E package name

2. Pipeline Operations Command 1 | Command 2

   Example: Rmp-qa | grep tar

3. View Help man [command name]

   Example: Man find

4. Shut down the system shutdown now
   

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Lesson6--linux command Explanation