Unix interview questions part 35
Unix interview questions part 35
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Total Questions: 20
1. What is the output of the following command? $ wc -c *.c
Correct Answer is : total size of .c files
2. In a pipeline, the command on the left of | must use standard output and one on the right must use standard input.
Correct Answer is : TRUE
3. Which command saves one copy of character stream in a file and store the other to standard output?
Correct Answer is : tee
4. tee is an internal command.
Correct Answer is : FALSE
5. Which of the following is not true about tee command?
Correct Answer is : it is a feature of the shell
6. Apart from its use in redirection, /dev/tty can also be used as an argument to some commands.
Correct Answer is : TRUE
7. Which of the following commands is known as stream editor?
Correct Answer is : sed
8. What is the correct syntax for using sed?
Correct Answer is : sed options ‘address action’ file(s)
9. Which one of the following command will be used for quitting after selecting 3 lines from file emp.lst?
Correct Answer is : sed ‘3q’ emp.lst
10. Which of the following command is used with sed for outputting as well as printing the selected lines?
Correct Answer is : p
11. To suppress the behavior of ‘p’ command of sed, we use ____ option.
Correct Answer is : -n
12. The command $ sed -n ‘$p’ emp.lst will display the last line.
Correct Answer is : TRUE
13. Consider the following commands. $ sed -n ‘1,2p’ emp.lst $ sed -n ‘3,$!p’ emp.lst The output of both commands will be the same.
Correct Answer is : TRUE
14. Which option is used with sed for using multiple instructions?
Correct Answer is : –f and -e
15. ____ option is used for taking instructions from a file.
Correct Answer is : -f
16. To perform context addressing, we have to enclose the pattern in ____
Correct Answer is : / /
17. To select lines containing gupta and agarwal, which command will be used?
Correct Answer is : sed -n ‘/gupta/,/agarwal/p’ emp.lst
18. To write selected lines, ____ is used with sed.
Correct Answer is : w
19. sed can also perform the substitution.
Correct Answer is : TRUE
20. Which one of the following is the correct syntax for performing substitution using sed?
Correct Answer is : sed [address]s /expr1/ expr2/ flags
