UNIX
1. which
symbol be used with grep command to match pattern pat at the beginning of the
line?->^pat
2. which
command is used to sort the lines of a data in a file in reverse order->sort
-r
3. which of
the command to change the protection mode of files starting emp and ending with
1,2 or 3?->chmod u+x emp[1-3]
4. which
command is used to remove the directory->rmdir(rd command is used to remove
an empty directory rmdir removes the directory, specified by the directory
parameter from the system)
5. find the
occurence of the word and print its occurence count->grep -o -i
"unix" myfile wc -l
grep is used
for search -i remove case sensitive , wc for word count -l is for print the
word count
6. what will
be the output of the below command?->find -type f -perm 0777 -print
->display
all files who has the three permission for all levels of user
7. which awk
script will give you the average of second column of the file named file1,
which has "l" as the delimiter?->awk
BEGIN(FS='l',s=0){s=s+$2}END{print s}file 1
8. which
command used to search "hello unix" in file ignoring case?->
grep -i
"hello unix" file name
9. which of
the following command in unix used to remove the duplicate lines->uniq
10. which
unix command is used to display the content of the file?->cat
11. which
unix command is used to count the number of lines, word and characters in a
file?->wc
12. what is
the purpose of chmod command?->modify file permissions
13. the pwd
command in unix is used for->printing current directory
14. which
command will display all hidden files in a directory->ls-a
15. what
does the >> operator do in unix?->appends output to a file
16. which
unix command displays the manual or help pages of a command?->man
17. which
unix command is used to display the process status?->ps
18. what
does the kill command do in unix->stops a running process
19. which
unix command can be used to display disk usage?->du
20. the
alias command in unix is used for->creating a shortcut for a command
21. which of
the following commands will display the last 100 lines of a file named
"data.txt"?->tail -n 100 data.txt
22. which is
primary purpose of the crontab command->schedule tasks to run at specific
intervals
23. which
command allows you to substitute a string in file?->sed
24. which
command is used to find the location of a program in unix->which
25. which command is used to send the output of one command as the input to another command?-> ( | )
26. what
does the chown command do?->change the owner of a file or directory
27. the IN
command in unix is used to->link files
28. which
command is used to repeat the last executed command in unix->!!
28. what
does the $? variable signify in unix->exit status of the last command
29. the touch command in unix is primarily used to modify file timestamps
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