Unix Pipes and Filters MCQs

This section focuses on "Pipes and Filters" in unix. These Multiple Choice Questions (MCQ) should be practiced to improve the unix skills required for various interviews (campus interviews, walk-in interviews, company interviews), placements, entrance exams and other competitive examinations.

1. What is true about pipes in unix?

A. Pipe can connect two commands together so that the output from one program becomes the input of the next program
B. To make a pipe, put a hash (#) on the command line between two commands.
C. Two or more commands connected in this way form a pipe.
D. Both A and C

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2. To make a pipe, put a ________ on the command line between two commands.

A. |
B. /
C. \
D. $

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3. Which command searches a file or files for lines that have a certain pattern?

A. erep
B. pgrp
C. grep
D. drep

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4. What does -c operation do in grep command?

A. Matches either upper or lowercase.
B. Prints only the count of matching lines.
C. Prints the matched line and its line number.
D. Prints all lines that do not match pattern.

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5. Which command is used to arranges lines of text alphabetically or numerically?

A. sort
B. psort
C. asort
D. series

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6. Which option is used ignores first x fields when sorting?

A. -x
B. +x
C. -X
D. +X

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7. If there are special characters in a pattern, then we've to enclose them in ______

A. single quotes
B. double quotes
C. Without any quotes
D. None of the above

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8. POSIX identifies regular expressions as belonging to ____ categories.

A. 2
B. 3
C. 4
D. 5

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9. Which of the following is not filter in unix?

A. cat
B. head
C. tail
D. cd

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10. Which of the following filter is used to remove duplicate lines?

A. cat
B. sed
C. uniq
D. grep

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