Test #3 Multiple Choice

                      Important Instructions

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

_________________________________________________________________

            Multiple Choice - 42 Questions - 10 of 20%

(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)

1.  Which command sequence correctly searches for str and then
    prints OK if it is found inside the file foo?
   *a. if grep <foo str ; then echo OK ; fi
    b. if [ grep str foo ] ; then echo OK ; fi
    c. if test str foo ; then echo OK ; fi
    d. if test str = foo ; then echo OK ; fi
    e. if [ test str foo ] ; then echo OK ; fi

2.  Which command sequence correctly compares the numbers and
    prints OK?
   *a. if [ 1 -lt 2 ] ; then echo OK ; fi
    b. if [ 2 > 1 ] ; then echo OK ; fi
    c. if [ ! 2 < 1 ] ; then echo OK ; fi
    d. if ( let 2 > 1 ) ; then echo OK ; fi
    e. if ( 1 let 2 ) ; then echo OK ; fi

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

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

5.  In an empty directory, what is the output on your screen of
    these commands:
       touch uu .u uv .v uw ; a="*u *v" ; echo "$a"
   *a. *u *v
    b. u* v*
    c. uu uv
    d. uu .u uv .v
    e. $a

6.  If a=cow and b=dog then what is the output on your screen of
    the following sequence of commands:
       [ $a = dog -o $b = dog ] ; echo $?
   *a. 0
    b. 1
    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

7.  If a=cow and b=dog then what is the output on your screen of
    the following sequence of commands:
       [ $a = cow -a $b = dog ] ; echo $?
   *a. 0
    b. 1
    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

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

9.  Which command line below allows programs in the current
    directory to execute without preceding the names with ./?
   *a. PATH=/usr/bin:.:/bin
    b. PATH=/usr/bin/.:$HOME
    c. PATH=./$HOME:/usr/bin
    d. $PATH=/usr/bin:./bin
    e. $PATH=.:$HOME:/usr/bin

10. What is the output on your screen of the following sequence
    of commands:   x=0 ; y=1 ; touch $x ; test ! -n $x ; echo $?
   *a. 1
    b. 0
    c. the number 1 or 0 followed by another 1 or 0 on a new line
    d. test: $x: integer expression expected
    e. no output

11. What is the output on your screen of the following sequence
    of commands:
       x=cow ; y=dog ; touch $y ; test -n $y ; echo $?
   *a. 0
    b. 1
    c. the number 0 or 1 followed by another 0 or 1 on a new line
    d. test: $y: integer expression expected
    e. no output

12. What is the output on your screen of the following sequence
    of commands:   x=pig ; y=bat ; touch $x ; [ -z $x ] ; echo $?
   *a. 1
    b. 0
    c. the number 0 or 1 followed by another 0 or 1 on a new line
    d. test: $x: integer expression expected
    e. no output

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

14. What is the output on your screen of the following sequence
    of commands:   a=9 ; b=9 ; [ $a -le $b ] ; echo $?
   *a. 0
    b. 1
    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

15. What is the output on your screen of the following sequence
    of commands:   x=0 ; [ $x ] ; echo $?
   *a. 0
    b. 1
    c. the number 0 or 1 followed by another 0 or 1 on a new line
    d. test: $x: unary operator expected
    e. no output

16. What is the output on your screen of the following sequence
    of commands:   i=00 ; [ $i = 0 ] ; echo $?
   *a. 1
    b. 0
    c. the number 0 or 1 followed by another 0 or 1 on a new line
    d. test: $i: integer expression expected
    e. no output

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

18. What is the output on your screen of this command sequence:
       echo pig >one ; echo bat | tail one
   *a. pig
    b. bat
    c. pig followed by bat
    d. bat followed by pig
    e. an error message

19. If dog=dog and cat=cat then which of the following command
    lines outputs only the word hi (and nothing else)?
   *a. test dog = dog && echo hi
    b. test dog -ne cat && echo hi
    c. [!dog = cat] && echo hi
    d. [dog -ne cat] || echo hi
    e. [dog!=dog] || echo hi

20. A shell script named bar is executed as follows:
       ./bar "a b" "c d e" f
    Inside the script is the line:   echo "$2"
    What is the output on your screen from this line?
   *a. c d e
    b. b
    c. b"
    d. $2
    e. a b

21. What is the output on your screen of this two-command
    sequence:   cd /etc || echo "cd $(pwd)"
   *a. no output
    b. cd /etc
    c. cd 0pwd)
    d. cd $(pwd)
    e. /etc

22. What is the output on your screen of this two-command
    sequence:   cd /bin/ls && echo "in $(pwd)"
   *a. bash: cd: /bin/ls: Not a directory
    b. in /etc
    c. in 0pwd)
    d. in $(pwd)
    e. no output

23. What is the output on your screen of this two-command
    sequence:   cd /bin && echo "cd $(pwd)"
   *a. cd /bin
    b. cd 0pwd)
    c. cd $(pwd)
    d. /bin
    e. no output

24. In an empty directory, what is the length of the longest file
    name created by the following two-command sequence:
       a="1234 123 12 1" ; touch '$a'
   *a. 2 characters
    b. 3 characters
    c. 4 characters
    d. 1 character
    e. 13 characters

25. If /bin/pig is a program that outputs xx and /usr/bin/pig is
    a program that outputs foo what is the output on your screen
    of this shell command sequence:
       PATH=/home:/bin:/dev:/usr/bin ; pig
   *a. xx
    b. foo
    c. foo followed by xx
    d. xx followed by foo
    e. bash: pig: command not found

26. 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 2 '$3' 1
    b. ./foo $1 '$2' $3
    c. ./foo '$1' "$3" $2
    d. ./foo $1 $2 $3
    e. ./foo $3 "$2" $1

27. What is the output on your screen of this sequence of three
    shell commands:  umask 457 ; mkdir dir ; ls -ld dir
   *a. d-wx-w---- 2 me me 128 Jan 9 9:34 dir
    b. d-w--w---- 2 me me 128 Jan 9 9:34 dir
    c. d-wx-w-rwx 2 me me 128 Jan 9 9:34 dir
    d. dr--r-xrwx 2 me me 128 Jan 9 9:34 dir
    e. dr-xr-xrwx 2 me me 128 Jan 9 9:34 dir

28. What is the output on your screen of this two command
    sequence: PATH=/bin/cat:/bin/sh:/bin/ls ; 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

29. Which command sequence below always outputs just the date
    only if the first argument is both a directory and not empty?
   *a. if [ -s "$1" -a -d "$1" ]; then date ; fi
    b. if [ "-s $1" && "-d $1" ]; then date ; fi
    c. if [ "$1" -eq -f -a "$1" -eq -d ]; then date ; fi
    d. if [ -s -a -d "$1" ]; then date ; fi
    e. if [ -n "$1" -o -d "$1" ]; then date ; fi

30. What is the output on your screen of this command sequence:
       true && echo Linux     Rocks $?
   *a. Linux Rocks 0
    b. Linux Rocks ?
    c. Linux     Rocks ?
    d. Linux     Rocks 1
    e. no output

31. What is the output on your screen of this command sequence:
       false && echo "linux     rules $?"
   *a. no output
    b. linux rules 1
    c. linux     rules 0
    d. linux     rules 1
    e. linux rules 0

32. Given the following command line:  read  one  two  three
    which user keyboard input line below will assign the text bb
    to the shell variable named two?
   *a. aa  bb  cc
    b. one=aa  two=bb  three=cc
    c. aa,bb,cc
    d. aa:bb:cc
    e. aa;bb;cc

33. If file /a contains 20 lines, and file /b contains 30 lines,
    then how many lines are in file /c after this sequence of
    shell commands:
       sort /a /b >/c ; cat /a >>/b ; sort /c /b /a >/c
   *a. 70
    b. 50
    c. 80
    d. 120
    e. no lines (empty file)

34. 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

35. If directory dir contains only these five two-character file
    names: a?, 11, ?1, 1*, .1, then which shell command below
    will remove only the single two-character name ?1 from the
    directory?
   *a. rm dir/\??
    b. rm dir/?1
    c. rm dir/1*
    d. rm dir/*1
    e. rm dir/??

36. Which of these commands makes a file owned by me, also
    executable by me?
   *a. chmod u+x ./myfile
    b. chmod x+u myfile
    c. chmod x=u ./myfile
    d. umask 777 myfile
    e. umask 111 myfile

37. Which line below is most likely to be the beginning of an
    error message?
   *a. echo 1>&2 "... "
    b. echo 1<&2 "... "
    c. echo 2>&1 "... "
    d. echo 2<$1 "... "
    e. echo 2>$1 "... "

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

39. In an empty directory, what is the output on your screen of
    this three-command sequence:
       touch za .z zb .w .1 ; f=".z* .w*" ; echo '$f'
   *a. $f
    b. .z* .w*
    c. .z .w
    d. za .z zb .w
    e. za zb .w*

40. 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 $3"
    e. cat "$? $? $?"

41. What is the output on your screen of this sequence of three
    shell commands:  echo ls >fil ; >fil ls fil ; wc fil
   *a. 1 1 4 fil
    b. 1 1 3 fil
    c. 1 1 2 fil
    d. 0 0 0 fil
    e. no output

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

Answer Key - DAT2330 - Ian Allen - Fall 2004 - DAT2330 Unix Test
                            #2 - 20%

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42
   1. a                            Macro .ans splits: 0
   2. a
   3. a
   4. a
    5. a
    6. a
    7. a
    8. a
   9. a
  10. a
  11. a
  12. a
   13. a
   14. a
   15. a
   16. a
  17. a
  18. a
  19. a
  20. a
   21. a
   22. a
   23. a
   24. a
  25. a
  26. a
  27. a
  28. a
   29. a
   30. a
   31. a
   32. a
  33. a
  34. a
  35. a
  36. a
   37. a
   38. a
   39. a
   40. a
  41. a
  42. a

Count of a:  42  100%

With 5 choices: 42
 1 2 3 4 5 6 7 8 9 10 11 12 13
 14 15 16 17 18 19 20 21 22 23
 24 25 26 27 28 29 30 31 32 33
 34 35 36 37 38 39 40 41 42

Macro .cmd splits: 14