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Computer Science :: Unix & Linux Basics

  1. The command to count the number of files in the current directory by using pipes, is

  2. A.

     ls | wc

    B.

     ls -l | wc -l

    C.

     ls | wc -w

    D.

     ls | ws -c

    E.

     None of the above

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  3. Which symbol will be used with grep command to match the pattern pat at the beginning of a line?

  4. A.

     ^pat

    B.

     $pat

    C.

     pat$

    D.

     pat^

    E.

     None of the above

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  5. Which command is used to sort the lines of data in a file in reverse order

  6. A.

     sort

    B.

     sh

    C.

     st

    D.

     sort -r

    E.

     None of the above

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  7. Which command is used to display the top of the file?

  8. A.

     cat

    B.

     head

    C.

     more

    D.

     grep

    E.

     None of the above

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  9. Which command is used to copy all files having the string chap and any two characters after that to the progs directory?

  10. A.

     cp chap?? progs

    B.

     cp chap* progs

    C.

     cp chap[12] /progs/*.*

    D.

     cp chap?? /progs/*

    E.

     None of the above

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  11. Which command is used to change protection mode of files starting with the string emp and ending with 1,2, or 3?

  12. A.

     chmod u+x emp[1-3]

    B.

     chmod 777 emp*

    C.

     chmod u+r ??? emp

    D.

     chmod 222 emp?

    E.

     None of the above

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  13. Which command is used to remove a directory?

  14. A.

     rd

    B.

     rmdir

    C.

     dldir

    D.

     rdir

    E.

     None of the above

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  15. Which of the following keys is used to replace a single character with new text?

  16. A.

     S

    B.

     s

    C.

     r

    D.

     C

    E.

     None of the above

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  17. Which command is used to extract specific columns from the file?

  18. A.

     cat

    B.

     cut

    C.

     grep

    D.

     paste

    E.

     None of the above

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  19. Which command sends the word count of the file infile to the newfile.

  20. A.

     wc infile >newfile

    B.

     wc newfile

    C.

     wc infile - newfile

    D.

     wc infile | newfile

    E.

     None of the above

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