Common Linux commands

1. Man provides help explanations for familiar or unfamiliar commands

For example: man ls, you can view the LS-related usage.

Note: Press Q or Ctrl + C to exit. in Linux, you can use Ctrl + C to terminate the currentProgramRun.

2. ls view the directory or file owner * and list the files under any directory

Eg: ls/usr/man

Ls-l

A. D indicates the directory. If it is a "-", it indicates a file. If it is l, it indicates a connection file (link)

B. Permission for file or directory permission. Read (R), write (w), and run (x) respectively ).

3. Copy files using CP

Eg: CP filename1 filename2 // copy filename1 to filename2

CP 1.C netseek/2.c // copy 1.C to the netseek directory and name it 2.c.

4. rm delete files and directories

Eg: Rm 1.C // Delete the. c file.

5. Remove the directory or change the file name.

Eg: MV filename1 filename2 // rename filename1 to filename2

MV qib. tgz ../qib. tgz // move to the upper-level directory

6. Change the current directory pwd on CD to view the complete path of the current directory

Eg: Pwd // view the current directory path

CD netseek // enter the netseek directory

CD // exit the current directory

7. Cat, more command

Displays the content of a file. The two commands are different: cat prints the file content all the time, and more is displayed on the split screen.

Eg; CAT> 1.C // you canCodePaste the post to the 1.C file and press Ctrl + D to save the code.

Cat 1.C or more 1.C // you can view the content in it.

Gcc-O 1 1.C // compile 1.C into the. exe file. We can compile the Code with this command.

8. Modify the CHMOD command permission usage: chmod one-digit octal number filename.

Eg: chmod U + x filenmame // you only want to run the command for yourself.

The u table shows the file owner. G indicates the group where the file is located. O indicates others; r table readable; W table writable; X table can run

Chmod g + x filename // the same group of people to execute

9. Clear, date command

Clear: clear screen, equivalent to CLS in DOS; date: displays the current time.

10. mount a hardware device

Usage: Mount [parameter] device load point to be loaded

Eg: Mount/dev/CDROM

CD/mnt/CDROM // enter the CD directory

11. Su switches to another person's identity without logging out.

Usage: su-l user name (if the user name defaults, the user name is switched to the root state)

Eg: su-l netseek (switch to the netseek user and the user will be prompted to enter the password)

12. whoami, whereis, Which, ID

Whoami: confirm your identity

Whereis: query the command directory and help document directory

Which: query the directory where the command is located (similar to whereis)

ID: print your UID and GID. (UID: the unique ID of a user. GID: the unique ID of a user group. Each user can have only one unique UID and gid)

Eg: whoami // display your login user name

Whereis bin: the directory where the bin is located. The directory is/usr/local/bin.

Which Bin

13. grep, find

Grep: Text Content Search; find: file or directory name and permission owner matching search

Eg: grep success */* Find all files in the current directory that contain success characters

14. Kill can kill a running or DEST process.

Eg; PS ax

15. passwd can be used to set a password

16. commands used by the history user

Eg: History // displays the commands used by the user in the past.

17 .!! Execute the last command

18. mkdir command

Eg: mkdir netseek // create the netseek directory

19. Tar decompression command

Eg: tar-zxvf nmap-3.45.tgz // extract this to the nmap-3.45 directory

20. Finger allows users to query data of other users

Eg: Finger // view the user's usage information

Finger root // view the Root Information

21. Touch creates a file