Test your UNIX basic knowledge how many

1, casually shut down the host is not allowed, just shut the terminal is not good, why?

2. What are the UNIX commands corresponding to the following DOS commands?
IPT> dir copy cd md comp date del time

3, which type of file does each of the following belong to?

(1)-rwxr-xr- (2)/bin (3)btyx3
(4)brw-rw-rw- (5)/etc/passwd
(6)crw- Rw-rw- (7)/user/lib

4. Where are the executable commands for UNIX systems mainly placed?

5. What is standard input and standard output?

6. How to transfer the output to the file file?

7. What is the easiest way to create a new file and enter simple text into it?

8. How to connect two files into one file in UNIX system?

9, what is a user group, how to define a group?

10. What are the advantages of file sharing based on symbolic links and ordinary links?

11. When writing a file in Vi, how to move the cursor up 10 lines, shift left 5 lines, right shift 7 words, to the front of the text, to the end of the text, to the beginning of the line, to the end of the line .

12. When writing a program in Vi, how to find the string XYZ between lines 10 and 20, and how to check if there is another XYZ below?

13. How do I change no to NO when writing a program in Vi?

14. When writing a program in Vi, it means to enter the editing, launch the editing, enter the last line state, exit Vi after writing the disk, and exit the Vi method without writing the disk.

15, how to copy and paste a word in Vi?

16, Vi commands x, dw, db, do, d, dd, dg, dlg, d5w, what is the meaning of each?

17, how to add a new user, how to set a password?

18. What is the user port file? Please explain the meaning of the items in the record.

19, please explain what is a multi-command line, multi-line command?