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Linux-Foundation


LFCS


Linux Foundation Certified System Administrator


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Question #241

Given a file called birthdays containing lines like: YYYY-MM-DD Name -

1983-06-02 Tim

    1. 1995-12-17 Sue

      Which command would you use to output the lines belonging to all people listed whose birthday is in May or June?


    2. grep '[56]' birthdays

      grep 05?6? birthdays

      grep '[0-9]*-0[56]-' birthdays

      grep 06 birthdays | grep 05


Answer: C Question #242

The script, script.sh, consists of the following lines:

#!/bin/bash echo $2 $1

Which output will appear if the command, ./script.sh test1 test2, is entered?


  • test1 test2

    test2 test1

    script.sh test2

    script.sh test1

    test1 script.sh


    • Answer: B Question #243

    Which approach will provide a listing of the contents in a tar archive?


  • Use the tar command with -t.

    Use the grep command.

    Use the find command.

    Use the zless command.

    Use the zlist command.


    • Answer: A Question #244

    Which character starts a comment line in a shell script file?


  • ;

    *

    #

    /


    • Answer: C

    What is the output of the following command sequence? for token in a b c; do

    echo -n "$token "; done


  • anbncn

    a b c

    "a " "b " "c "

    token token token

    abc


    • Answer: B Question #246

    What is the correct command to extract the contents of the archive file download.bz2?


  • unpack download.bz2

    unzip2 download.bz2

    bunzip2 download.bz2

    unzip download.bz2

    uncompress download.bz2


    • Answer: C Question #247

    Which command chain will count the number of regular files with the name of foo.txt within /home?


  • ls -lR /home | grep foo.txt | wc -l

    find /home -type f -name foo.txt | wc -l

    find /home -name foo.txt -count

    find /home -name foo.txt | wc -l

    grep -R foo.txt /home | wc -l


    • Answer: B Question #248

    Which of the following command sequences overwrites the file foobar.txt?


  • echo "QUIDQUIDAGIS" >> foobar.txt

    echo "QUIDQUIDAGIS" < foobar.txt

    echo "QUIDQUIDAGIS" > foobar.txt

    echo "QUIDQUIDAGIS" | foobar.txt


    • Answer: C Question #249

    Which of the following commands redirects the output of cmd to the file foo.txt, in which an existing file is overwritten?


  • cmd || foo.txt

    cmd | foo.txt

    cmd && foo.txt

    cmd >> foo.txt

    cmd > foo.txt

    • Answer: E Question #250

    What does the exit status 0 indicate about a process?


  • The process ended without any problems.

    The process was terminated by the user.

    The process couldn't finish correctly.

    The process waited for an input but got none.

    The process finished in time.


    • Answer: A Question #251

    Which of the following commands will output all of the lines with the name Fred in upper or lower case but not the word red from the file data_file? (Choose two)


  • grep -v fred data_file

    grep '[f]red' data_file

    egrep fred data_file

    grep '[Ff]red' data_file

    grep -i fred data_file


    • Answer: DE Question #252

    The output of the program date should be saved in the variable actdat. What is the correct statement?


  • actdat=`date`

    set actdat='date'

    date | actdat

    date > $actdat

    actdat=date


    • Answer: A Question #253

    SIMULATION -

    What two character sequence is present at the beginning of an interpreted script? (Please specify the TWO correct characters only)


    Answer: #! Question #254

    How can the current directory and its subdirectories be searched for the file named MyFile.xml?


  • find . -name MyFile.xml

    grep MyFile.xml | find

    grep -r MyFile.xml .

    less MyFile.xml

    search Myfile.xml ./


    • Answer: A

    Which of the following commands will set the variable text to olaf is home? (Choose two)


  • text=olaf\ is\ home

    text=$olaf is home

    $text='olaf is home'

    text=='olaf is home'

    text="olaf is home"


    • Answer: AE Question #256

    Which of the following commands will create an archive file, named backup.tar, containing all the files from the directory /home?


  • tar /home backup.tar

    tar -cf /home backup.tar

    tar -xf /home backup.tar

    tar -xf backup.tar /home

    tar -cf backup.tar /home


    • Answer: E