"Linux" Linux common Basic Command Summary (recommended) _linux

Many of the most common commands in Linux must be mastered, and here I share some of the basic commands I learned when I started Linux, hoping to help you.

This is I will be the book on the bird in the collation, I hope not to involve copyright issues.

1, display the date of instruction: date

2, display the calendar instructions: Cal

3, simple and easy to use calculator: BC

How does 10/100 turn out to be 0? This is because the BC preset outputs only integers, and if you want to output the decimal point number, you must perform Scale=number, which is the number of decimal places, for example:

4, important several hot keys [tab],[ctrl]-c, [ctrl]-d

[TAB] Key---The function of "command complement" does not "file complete"

[Ctrl]-c Key---Let the current program "Stop"

[The CTRL]-D key---typically represents: "Keyboard input ends (end of File, EOF ring Ofinput)", and he can also be used to replace exit

5, Mans

Exit with Q,

Man-f Mans

6. Data Synchronization Write Disk: Sync

Enter sync, the data that is not yet updated in memory, is written to the hard drive, so this 挃 order is important before the system shuts down and reboots 乀. It's best to do it more times!
7, the customary shutdown instructions: shutdown
In addition, it is important to note that the time parameters must be added to the instructions, otherwise shutdown will automatically jump to Run-level 1 (that is, single maintenance login), so nerve-racking! Here are some examples of time parameters:
Reboot, Shutdown: reboot, Halt,poweroff

8. Switch execution level: init

There are seven levels of execution for Linux:

--run Level 0: Shutdown

--run Level 3: Plain text mode

--run Level 5: Contains graphics interface mode

--run Level 6: Reboot

Use the init command to toggle each mode:

If you want to shut down, you can also use the following instructions to turn off the computer except for the shutdown-h now and Poweroff:

9, change the file belongs to the group: CHGRP

10. Change document owner: Chown

He can also modify the name of the group directly mandatory

11, change the file permissions: chmod

There are two ways to set permissions, and you can use numbers or symbols to change permissions.

--Number Type change file permissions:

--Symbol Type change file permissions:

12, view version information, etc.

13. Transform Directory: CD

14. Display the current directory: PWD

15, the establishment of a new directory: mkdir

It is not recommended to use the-p option because you are worried that if you typo, the directory name will be messed up.

16, delete the "empty" directory: RmDir

17, File and directory display: LS

18, copy the file or directory: CP

19. Remove file or directory: RM

20, mobile files and directories, or renamed: MV

21, get the path of the file name and directory name: Basename,dirname

22, starting from the first line to display the contents of the file: Cat

23, starting from the last line: TAC (you can see that the TAC is cat-written backwards)

24, display time, by the output line number: NL

25, one page of the display file content: more

26, and more similar, but better than more, he can turn the page forward: less

27, only a few lines: Head

28, only look at the end of a few lines: tail

29. Read the contents of the file in binary position: OD

30, modify the file time or new file: Touch

31, File preset permissions: umask

32. Profile file Hidden properties: chattr

33. Display file hidden attribute: lsattr

34, observe the file type:

35, looking for "execution block": which

36, looking for specific files: Whereis

37, looking for specific files: locate

38, looking for specific files: find

39, compressed files and read compressed files: Gzip,zcat

40, compressed files and read compressed files: Bzip2,bzcat

41, compressed files and read compressed files: Tar

Well, exhausted, finally finished, hope to be able to help everyone. We also hope that we can support the cloud-dwelling community.