Unix Questions and Answers

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Q1
Which symbol will be used with grep command to match the pattern pat at the beginning of a line?
  • A ^pat
  • B $pat
  • C pat$
  • D pat^
Answer: Option A
Q2
Which command is used to sort the lines of data in a file in reverse order
  • A sort
  • B sh
  • C st
  • D sort -r
Answer: Option D
Q3
Which command is used to display the top of the file?
  • A cat
  • B head
  • C more
  • D grep
Answer: Option B
Q4
Which command is used to copy all files having the string chap and any two characters after that to the progs directory?
  • A cp chap?? progs
  • B cp chap* progs
  • C cp chap[12] /progs/*.*
  • D cp chap?? /progs/*
Answer: Option A
Q5
Which command is used to change protection mode of files starting with the string emp and ending with 1,2, or 3?
  • A chmod u+x emp[l-3]
  • B chmod 777 emp*
  • C chmod u+r ??? emp
  • D chmod 222 emp?
Answer: Option A
Q6
Which command is used to remove a directory?
  • A rd
  • B rmdir
  • C dldir
  • D rdir
Answer: Option B
Q7
Which of the following keys is used to replace a single character with new text?
  • A S
  • B s
  • C r
  • D C
Answer: Option B
Q8
Which command is used to extract specific columns from the file?
  • A cat
  • B cut
  • C grep
  • D paste
Answer: Option B
Q9
Which command sends the word count of the file infile to the newfile.
  • A wc infile >newfile
  • B wc <infile >newfile
  • C wc infile - newfile
  • D wc infile | newfile
Answer: Option A
Q10
Which command is used to remove the read permission of the file 'note' from both the group and others?
  • A chmod go+r note
  • B chmod go+rw note
  • C chmod go-x note
  • D chmod go-r, 4-x note
Answer: Option D

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