linux FAQ(zz)
Ans : $echo $shell
2.Which is the command used to view the environment variables?
Ans: printenv
3. How do you recall last command from the history list in Cshell ?
Ans: !!
4. How do you print the current job in Cshell ?
Ans: %%
5. Which is the command used to find the no of bytes in the file shell ?
Ans: du file name
6. Which is the command used to edits the input stream, line by line?
Ans: sed
7. What is the difference between finger and who?
Ans: Finger was a way to get information about a user from another system Who is used to find who all are using current machine.
8. Which are the Protocols used to access remote machines?
Ans: SSH ,RSH ,FTP
9. Which is the basic command while transfer a file from your home to the other user?
Ans: FTP
10. Which is command used to create a file Linus of zero bytes?
Ans: touch
11. Which is the command used to select parts of a line?
Ans: cut filename
12. How do you Find the free space of the hard disk in your home?
Ans: df filename
Ans: cmp file A file B
14. Which is the command used to find the number of files in directory?
Ans: ls | wc -l
15. How will you change your shell?
Ans: tcsh
16. How will you change file permissions?
Ans: using chmod
17. Difference between find and locate?
Ans: Locate uses an internal database to look up indexed files. This database need to be updated using a command “updatedb”.
Find does only a normal search.
18. How will you search for a pattern
(String) in a file?
Ans: grep “string” filename
19. How will you kill a process? Give one
example?
Ans: 1. ps = It will list all processes on
that shells
2. kill process ID
20. How will you remove a file
interactively?
Ans: rm -i filename
21. Can we remove a nonempty directory? If
yes how?
Ans: rm -rf dirname
22. What do you mean by “su”? What is the
difference between “su” and “su -“?
Ans:su means switch user it changes the
shell we to key a exit to come back to previous shell.
23. How will you delete 50 lines in
vi?
Ans:50 dd in escape mode.
24. How will you search for a pattern in
vi?
Ans: ?pattern
25. How will you perform cut and paste in
vi?
Ans: dd for cut p for paste
26. How to list out the files in a
directory according to there size?
Ans: ls -S
27. How to insert a word as firstword for
all lines in the text?
Ans : sed -i s/word/firstword/
Ans : C
Ans : C
Ans : C
Ans : B
32. Which of the following characters is
used to signify the end of a line?
A. %
B.
$
C.
^
D.
~
Ans : B
Ans : B
Ans : D
Ans : D
Ans : B
Ans : B
Ans : A
Ans : C
40. Which of the following utilities
processes most quickly?
A. grep B. egrep C. fgrep
Ans : The fgrep utility does not have the
same regular expression set as the other two, and is thus able to
execute the fastest hence ans is C.
Ans : B
Ans : D
43. Which is the command used to create
chain of directories?
Ans : mkdir -p dir1/dir2/dir3
44. Which is the command used to see two
files at a time?
Ans : vim -o filename1
filename2
45. What is the usage of top
command?
Ans : It will list all the currently
running processes on CPU.
46. How we can use a sed command as a head
command?
Ans : sed “5q” filename
47. What is the result of
“%s/Kacper/Kacpertech/g “?
Ans : Kacper will get replaced my another
string Kacpertech in all the lines of the file.
Ans : C
49. Write a syntax for foreach loop in
shell script?
Ans : foreach variable name (some
list)
command1
command2
.........
end
50. How we can set the date and time for
the files?
Ans : using touch operator
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