Test #2 Multiple Choice

                      Important Instructions

     1. Read all the instructions and both sides (back and front) of all pages.
     2. Manage your time when answering questions on this test.
        Answer the questions you know, first.

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            Multiple Choice - 55 Questions - 12 of 25%

(Office use only: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
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1.  Given my directory dir and my file dir/bar owned by me, which
    permissions allow me to change or create new content (data)
    in the file dir/bar but not delete the file?
   *a. Permissions 500 on directory dir and 600 on file dir/bar.
    b. Permissions 100 on directory dir and 100 on file dir/bar.
    c. Permissions 200 on directory dir and 200 on file dir/bar.
    d. Permissions 400 on directory dir and 400 on file dir/bar.
    e. Permissions 600 on directory dir and 700 on file dir/bar.

2.  Given my directory dir and my file dir/bar owned by me, which
    permissions allow me to delete the file dir/bar from the
    directory, but not change the content (data) in the file?
   *a. Permissions 300 on directory dir and 400 on file dir/bar.
    b. Permissions 100 on directory dir and 300 on file dir/bar.
    c. Permissions 100 on directory dir and 500 on file dir/bar.
    d. Permissions 300 on directory dir and 200 on file dir/bar.
    e. Permissions 500 on directory dir and 500 on file dir/bar.

3.  In response to the following command line:
       read  var1  var2  var3
    which user keyboard input line below will assign the text
    three to the shell variable named var3?
   *a. one  two  three
    b. var1=one  var2=two  var3=three
    c. one,two,three
    d. one:two:three
    e. $var1="one"  $var2="two"  $var3="three"

4.  How many arguments and options are there to the command:
       sort -r <infile
   *a. One command line argument containing one option name.
    b. Two arguments, one of which is a single option name and
       the other is a pathname.
    c. Three arguments, one of which contains an option and one
       is a pathname.
    d. A file name starting with a dash and an <infile switch
       option argument.
    e. Two arguments, neither of which is an option.

5.  How many arguments are passed to the command by the shell on
    this command line:   foo <ls -b "-a -r" >wc cat
   *a. 3
    b. 4
    c. 5
    d. 6
    e. 2

6.  If foo is a script containing the line TERM=linux ; export
    TERM, what is the output on your screen of the following
    sequence of commands:  TERM=vt100 ; ./foo ; echo "$TERM"
   *a. vt100
    b. linux
    c. foo
    d. TERM
    e. $TERM

7.  If bat=1 and cat=2 then which of the following command lines
    outputs only the word foo (and nothing else)?
   *a. [ bat = bat ] && echo foo
    b. [ bat -ne cat ] && echo foo
    c. [!bat = cat] && echo foo
    d. [bat -eq 1] || echo foo
    e. [bat!=bat] || echo foo

8.  If dog is an executable script containing the line:
       umask 0777
    what is the output on your screen of the following sequence
    of commands:  umask 0022 ; ./dog ; umask
   *a. 0022
    b. 0777
    c. 0799
    d. 0755
    e. nothing; no output on screen

9.  If foo is a file containing the first column of the output of
    the last command, which command line shows the most frequent
    login?
   *a. sort foo | uniq -c | sort -n | tail -1
    b. cat sort foo | uniq -c | sort -nr | head -1
    c. uniq -c foo | sort -nr | head -1
    d. sort | uniq -c | sort -n | tail -1 foo
    e. sort foo > uniq -c ; sort -nr uniq | head -1

10. If a=1 and b=1, which command sequence correctly compares the
    two numbers as equal and prints OK?
   *a. if [ $a -eq $b ] ; then echo OK ; fi
    b. if test a -eq b ; then echo OK ; fi
    c. if [ a = b ] ; then echo OK ; fi
    d. if ( a == b ) ; then echo OK ; fi
    e. if [ $a==$b ] ; then echo OK ; fi

11. If a=cow and b=dog then what is the output on your screen of
    the following sequence of commands:
       if $a = $b ; then echo $a ; fi
   *a. bash: cow: command not found
    b. test: cow: integer expression expected
    c. test: $a: integer expression expected
    d. cow
    e. no output on screen

12. If a=cow and b=dog then what is the output on your screen of
    the following sequence of commands:
       [ $a = cow -a $b = cow ] || echo $?
   *a. 1
    b. 0
    c. the number 1 or 0 followed by another 1 or 0 on a new line
    d. test: $a: integer expression expected
    e. no output on screen

13. If a shell script named foo contains the line:
       if [ '$3' = "$2" ] ; then echo SAME ; fi
    then which of the following command lines will always produce
    SAME as output?
   *a. ./foo 1 '$3' 2
    b. ./foo $1 '$2' $3
    c. ./foo '$1' "$3" $2
    d. ./foo $1 $2 $3
    e. ./foo $3 "$2" $1

14. If directory /dir contains these three four-character file
    names: .123, .124, .???, then what is the output on your
    screen of the following command line:  echo /dir/????
   *a. /dir/????
    b. /dir/.123 /dir/.124 /dir/.???
    c. /dir/.123 /dir/.124
    d. echo: /dir/????: No such file or directory
    e. no output on screen

15. If file foo occupies two disk blocks, how many disk blocks
    are in use after this sequence of commands:
       cp foo bar ; ln bar one ; cp one two ; cp one ten
   *a. 8 blocks
    b. 6 blocks
    c. 4 blocks
    d. 2 blocks
    e. 10 blocks

16. If variable x might contain nothing (a null value - defined
    but empty), which command sequence correctly tests for this
    and prints OK?
   *a. if [ "$x" = "" ] ; then echo OK ; fi
    b. if [ $x -eq : ] ; then echo OK ; fi
    c. if [ $x -eq "" ] ; then echo OK ; fi
    d. if [ ''$x'' = '''' ] ; then echo OK ; fi
    e. if [ "$x" = * ] ; then echo OK ; fi

17. If /bin/bat is a program that outputs mom and /usr/bin/bat is
    a program that outputs hi what is the output on your screen
    of this shell command sequence:
       PATH=/usr:/usr/bin:/bin ; bat
   *a. hi
    b. mom
    c. mom followed by hi
    d. hi followed by mom
    e. bash: bat: command not found

18. If /bin/foo is a program that outputs one and /usr/bin/foo is
    a program that outputs two, what is the output on your screen
    of this command sequence:
       PATH=/bin/ls:/home:/usr/bin/cat:/etc ; foo
   *a. bash: foo: command not found
    b. one
    c. two
    d. two followed by one
    e. one followed by two

19. If the file dog contained the word bar, what would be the
    output on your screen of this two command sequence:
       PATH=/bin/ls:/bin/who:/etc/passwd ; /bin/ls dog
   *a. dog
    b. bar
    c. /bin/ls: dog: No such file or directory
    d. bash: /bin/ls: command not found
    e. no output on screen

20. If your PATH variable contains /bin:/usr/bin, what is the
    output on your screen of this command line:   echo '$PATH'
   *a. $PATH
    b. '$PATH'
    c. /bin:/usr/bin
    d. '/bin:/usr/bin'
    e. echo: $PATH: No such file or directory

21. What is the output on your screen of this two command
    sequence: PATH=/bin/ls:/bin/sh:/bin/cat ; ls nosuchfile
   *a. bash: ls: command not found
    b. bash: /bin/ls: command not found
    c. ls: /bin/ls: command not found
    d. ls: nosuchfile: No such file or directory
    e. bash: /bin/sh: No such file or directory

22. Which of the following PATH statements makes the most sense?
   *a. PATH=/etc:/usr/bin:/bin
    b. PATH=/bin:/usr/bin:/etc/passwd
    c. PATH=/bin/ls:/etc:/usr/bin
    d. PATH=/bin:/bin/cat:/usr/bin
    e. PATH=/bin/sh:/usr/bin:/etc:/bin

23. In a directory containing one file named foo, what appears on
    your screen after this command line?   ls 1>/dev/null *
   *a. no output on screen
    b. foo
    c. *
    d. ls: 1>/dev/null: No such file or directory
    e. bash: 1>/dev/null: command not found

24. In a directory containing one file named foo, what appears on
    your screen after this command line?
       ls 2>/dev/null nosuchfile *
   *a. foo
    b. no output on screen
    c. nosuchfile foo
    d. ls: nosuchfile: No such file or directory
    e. ls: 2>/dev/null: No such file or directory

25. In an empty directory, what is the length of the longest file
    name (including extension) after this sequence of commands?
       ls >4444 ; cp 4444 55555 ; mv 55555 22 ; bzip2 22
   *a. 6
    b. 5
    c. 4
    d. 3
    e. 7

26. Select the correct bash shell order of command line
    processing:
   *a. quotes, redirection, variables, GLOBs
    b. quotes, variables, redirection, GLOBs
    c. quotes, variables, GLOBs, redirection
    d. quotes, GLOBs, variables, redirection
    e. redirection, quotes, GLOBs, variables

27. What appears on your screen after this command line?
       echo foo >ls ; cat ls > wc
   *a. no output on screen
    b. 1  1  2
    c. 1  1  3
    d. ls
    e. foo

28. What appears on your screen after this sequence of commands:
       echo 1 >x ; cp x y ; echo 2 >>y ; sort x >y ; cat y
   *a. 1
    b. 1 followed by 2
    c. 2
    d. 2 followed by 1
    e. empty file - no output on the screen

29. What appears on your screen after this sequence of commands:
       echo 1 >x ; ln x y ; echo 2 >>y ; tail -1 x >y ; cat y
   *a. empty file - no output on the screen
    b. 1
    c. 2
    d. 1 followed by 2
    e. 2 followed by 1

30. What appears on your screen after this sequence of commands:
       echo 1 >x ; ln x y ; echo 2 >>y ; sort -rn x
   *a. 2 followed by 1
    b. 1 followed by 2
    c. 1
    d. 2
    e. empty file - no output on the screen

31. What is in the file named file after this command sequence:
       echo a >x ; echo b >>x ; mv x y >file
   *a. nothing - file is empty - no data
    b. a followed by b
    c. a
    d. b
    e. no such file (nonexistent file)

32. What is the correct syntax to redirect both standard output
    and standard error into the same output file?
   *a. ls -l >foo 2>&1
    b. ls -l 2>&1 >foo
    c. ls -l >foo 2>$1
    d. ls -l 2>$1 >foo
    e. ls -l >foo 2>foo

33. What is the link count of directory dir after this set of
    successful commands?
       mkdir dir ; cd dir ; touch a ; mkdir b c d e
   *a. 6
    b. 5
    c. 4
    d. 3
    e. 7

34. What is the link count of file foo after this set of
    successful commands?
    rm foo ; touch foo ; cp foo x ; cp x foo
    ln foo a ; ln x y ; ln a z ; ln x b
   *a. 3
    b. 4
    c. 5
    d. 6
    e. 2

35. What is the output on your screen if a user signals an end-
    of-file from the keyboard during this command sequence?
       read input || echo $?
   *a. 1
    b. no output on screen
    c. $?
    d. 0
    e. an error message

36. What is the output on your screen of the following command
    sequence:   a=1 ; b=2 ; test $b -ge $a ; echo $?
   *a. 0
    b. 1
    c. the number 1 or 0 followed by another 1 or 0 on a new line
    d. test: $b: integer expression expected
    e. no output on screen

37. What is the output on your screen of the following command
    sequence:   a=sky ; touch $a ; test ! -z $a ; echo $?
   *a. 0
    b. 1
    c. sky
    d. test: $a: integer expression expected
    e. no output on screen

38. What is the output on your screen of the following sequence
    of commands:   cd /etc && echo "in $(pwd)"
   *a. in /etc
    b. no output on screen
    c. in 0pwd)
    d. in $(pwd)
    e. bash: cd: /etc: No such file or directory

39. What is the output on your screen of the following sequence
    of commands:   x=ok ; y=ok ; [ x = y ]
   *a. no output on screen
    b. 1
    c. 0
    d. bash: x: command not found
    e. test: x: integer expression expected

40. What is the output on your screen of this sequence of three
    shell commands:  umask 547 ; mkdir newdir ; ls -ld newdir
   *a. d-w--wx--- 1 me me 0 Feb 20 07:55 newdir
    b. dr-xr--rwx 1 me me 0 Feb 20 07:55 newdir
    c. dr--r--rw- 1 me me 0 Feb 20 07:55 newdir
    d. d-w--w---- 1 me me 0 Feb 20 07:55 newdir
    e. d-w--wxrwx 1 me me 0 Feb 20 07:55 newdir

41. What is the output on your screen of this sequence of three
    shell commands:  umask 674 ; touch newfile ; ls -l newfile
   *a. --------w- 1 me me 0 Feb 20 07:55 newfile
    b. -rw-rwxr-- 1 me me 0 Feb 20 07:55 newfile
    c. -rw-rw-r-- 1 me me 0 Feb 20 07:55 newfile
    d. ---x----wx 1 me me 0 Feb 20 07:55 newfile
    e. --w--wxr-x 1 me me 0 Feb 20 07:55 newfile

42. What is the output on your screen of this two-command
    sequence if run in a directory containing 100 files with
    names that are all the numbers from 1 to 100 inclusive:
         foo="*" ; echo $foo
   *a. the file names 1 through 100
    b. all the file names that start with an asterisk ('*')
    c. an asterisk ('*') and the file names 1 through 100
    d. *
    e. $foo

43. What is true about this output from:  ls -il foo bar
    23 -rwxr----- 3 bin  bin  2 Jul 31 12:33 foo
    23 -rwxr----- 3 bin  bin  2 Jul 31 12:33 foo
   *a. foo and bar are names for the same file
    b. foo and bar are names for different files
    c. foo and bar are two of three names for this file
    d. foo and bar each have three names (six names total)
    e. this output is not possible

44. What is true about this output from:  ls -il foo bar
    15 -r-x-----x 3 root root 3 Oct 30 09:23 foo
    16 -r-x-----x 3 root root 3 Oct 30 09:23 foo
   *a. foo and bar are names for different files
    b. foo and bar are names for the same file
    c. foo and bar are two of three names for this file
    d. foo and bar each have two names (four names total)
    e. this output is not possible

45. What is true about this output from:  ls -il foo bar
    35 -rw-rw-r-- 2 bin  bin  3 Jan 24 01:03 foo
    35 -r--r--r-- 2 bin  bin  3 Jan 24 01:03 foo
   *a. this output is not possible
    b. foo and bar are names for different files
    c. foo and bar are names for the same file
    d. foo and bar are two of three names for this file
    e. foo and bar each have two names (four names total)

46. What minimal permissions must you have on a directory to be
    able to execute successfully the command ls . from inside the
    directory?
   *a. r-x
    b. --x
    c. r--
    d. -wx
    e. rw-

47. What will appear on your screen if you execute this sequence
    of commands:
       echo 1 >a ; ln a b ; echo 2 >b ; chmod 307 b ; cat a
   *a. an error message
    b. 1
    c. 2
    d. 1 followed by 2
    e. no output on screen

48. Which command line locates scripts in the /etc directory?
   *a. file /etc/* | grep script
    b. file /etc | grep script
    c. cat /etc/* | file | grep script
    d. cat /etc | file | grep script
    e. ls /etc/* | file | grep script

49. Which command line shows just the count of words in the file?
   *a. wc file | awk '{print $2}'
    b. wc file | awk '{print #2}'
    c. wc file | awk '{print 2}'
    d. wc file | awk '[print $2]'
    e. wc file | awk '[print #2]'

50. Which command line shows the file in /etc with the largest
    checksum?
   *a. sum /etc/* | sort -nr | head -1
    b. sum /etc | sort -nr | head -1
    c. cat /etc/* | sum | sort -nr | head -1
    d. cat /etc | sum | sort -nr | head -1
    e. ls /etc/* | sum | sort -nr | head -1

51. Which command sequence below always outputs just the date
    only if the first argument is either a file or a directory?
   *a. if [ -f "$1" -o -d "$1" ]; then date ; fi
    b. if [ "-f $1" || "-d $1" ]; then date ; fi
    c. if [ "$1" -eq -f -o "$1" -eq -d ]; then date ; fi
    d. if [ -f -o -d "$1" ]; then date ; fi
    e. if [ -f || -d "$1" ]; then date ; fi

52. Which command sequence correctly searches for the string and
    then prints OK if it is found inside the password file?
   *a. if grep string /etc/passwd ; then echo OK ; fi
    b. if [ grep string /etc/passwd ] ; then echo OK ; fi
    c. if test string /etc/passwd ; then echo OK ; fi
    d. if test string = /etc/passwd ; then echo OK ; fi
    e. if [ test string /etc/passwd ] ; then echo OK ; fi

53. Which line below passes three separate arguments to the cat
    command when placed inside a shell script named foo invoked
    by the command line:  ./foo  one  two  three
   *a. cat "$@"
    b. cat "$*"
    c. cat "$#"
    d. cat "$1 $2 $3"
    e. cat "$? $? $?"

54. Which line below puts the count of the number of lines in the
    password file into the variable count?
   *a. count=$( wc -l </etc/passwd )
    b. count=$( cat -c /etc/passwd )
    c. count=$( wc /etc/passwd | awk echo $1 )
    d. count=$( wc -l /etc/passwd | awk "print $1" )
    e. count=$( awk -F: /etc/passwd | wc -l )

55. Which of these commands makes a file owned by me, also
    readable by me?
   *a. chmod u+r ./myfile
    b. chmod r+u myfile
    c. chmod r=u ./myfile
    d. umask 400 myfile
    e. umask 300 ./myfile

Answer Key - CST8129 - Ian Allen - Fall 2005 - CST8129 Unix Test
                            #2 - 25%

Office use only: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
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42 43 44 45 46 47 48 49 50 51 52 53 54 55
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