Unix problems
- 1. Which of the following command addresses all users who are currently hooked on?
Options- A. write
- B. mail
- C. wall
- D. mesg
- E. None of the above Discuss
Correct Answer: wall
- 2. Which command is used to count just the number of characters in a file?
Options- A. wc - 1
- B. wc -c
- C. wc -w
- D. wc -r
- E. None of the above Discuss
Correct Answer: wc -c
- 3. Which command is used to extract specific columns from the file?
Options- A. cat
- B. cut
- C. grep
- D. paste
- E. None of the above Discuss
Correct Answer: cut
- 4. The field separator in cut command is specified with
Options- A. -a option
- B. -d option
- C. -r option
- D. -x option
- E. None of the above Discuss
Correct Answer: -d option
- 5. Which command sends the word count of the file infile to the newfile.
Options- A. wc infile >newfile
- B. wc <infile >newfile
- C. wc infile - newfile
- D. wc infile | newfile
- E. None of the above Discuss
Correct Answer: wc infile >newfile
- 6. Which option is used with rm command to make the command prompt the user with each filename and a?, before acting on it
Options- A. -r
- B. -x
- C. -i
- D. -1
- E. None of the above Discuss
Correct Answer: -i
- 7. Which of the following commands is used to list contents of directories?
Options- A. ls
- B. lp
- C. dir
- D. tar
- E. None of the above Discuss
Correct Answer: ls
- 8. Which option will be used with sort command to start sorting ofter the nth column of the (m+l)th field?
Options- A. -m.n
- B. +m.n
- C. + n.m+1
- D. +(m+l).n
- E. None of the above Discuss
Correct Answer: +m.n
- 9. Which command is used to concatenate all files beginning with the string 'emp' and followed by a non-numeric characters?
Options- A. cat emp[!0-9]
- B. more [emp][!0-9]
- C. cat emp[x-z]
- D. cat emp[a-z]
- E. None of the above Discuss
Correct Answer: cat emp[!0-9]
- 10. Which command is used to copy all files having the string chap and any two characters after that to the progs directory?
Options- A. cp chap?? progs
- B. cp chap* progs
- C. cp chap[12] /progs/*.*
- D. cp chap?? /progs/*
- E. None of the above Discuss
Correct Answer: cp chap?? progs
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