Unix interview questions part 19
Unix interview questions part 19
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Total Questions: 20
1. If there are special characters in a pattern, then we’ve to enclose them in ______
Correct Answer is : double quotes
2. Which option is used with grep command for ignoring the case in pattern searching?
Correct Answer is : -i
3. Which option is used with grep command for deleting lines?
Correct Answer is : -v
4. Which option is used for displaying the line numbers containing the pattern along with lines?
Correct Answer is : -n
5. ______ option counts the number of lines containing the pattern?
Correct Answer is : -c
6. Which option displays only the filename containing the pattern?
Correct Answer is : -l
7. _____ option is used when we need to match multiple patterns in a single invocation of grep command?
Correct Answer is : -e
8. For taking patterns from a file, -f option is specified with grep command.
Correct Answer is : TRUE
9. POSIX identifies regular expressions as belonging to ____ categories.
Correct Answer is : 2
10. grep command supports both extended and regular expressions.
Correct Answer is : TRUE
11. Which of the following is not a subset of BRE (basic regular expression) character subset?
Correct Answer is : ch+
12. Character class is used for matching a group of characters enclosed within a pair of _____
Correct Answer is : [ ]
13. The following command will match ‘Agarwal’, ‘agarwal’ and ‘agrawal’. $ grep “[aA]g[ar][ar]wal” emp.lst
Correct Answer is : TRUE
14. Which of the following symbol is used for matching the immediately preceding character?
Correct Answer is : *
15. Which symbol is used for matching a single character?
Correct Answer is : .
16. Which of the following symbols are used for matching a pattern at specified locations?
Correct Answer is : ^ and $
17. The following command will match the lines beginning with ‘2’. $ grep “^2” emp.lst
Correct Answer is : TRUE
18. Which of the following symbols are a set of ERE (extended regular expressions)?
Correct Answer is : #NAME?
19. Which option is used when we want to use an ERE with grep command?
Correct Answer is : -E
20. Which of the following symbols are used for matching multiple patterns?
Correct Answer is : ( and )
