Unix Test #2
DAT2330 - Ian Allen - Winter 20-1-		      100 minutes

Evaluation: 70 Questions	  Name: _________________________
		      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 - 70 Questions - 20% of 30%

(Office use only: 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 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
64 65 66 67 68 69 70)

1.  If a=1 and b=1, which bash 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

2.  If variable x might contain nothing (a null value - defined
    but empty), which bash 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

3.  If a=aaa and b=bbb then what is the output of the following
    sequence of bash commands:	 if $a = $b ; then echo $a ; fi
    a. bash: aaa: command not found
    b. test: aaa: integer expression expected
    c. test: $a: integer expression expected
    d. aaa
    e. no output

4.  If a=ant and b=bat then what is the output of the following
    sequence of bash commands:
       [ $a = bat -o $b = bat ] ; 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











70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-2-		      100 minutes

5.  If a=ant and b=bat then what is the output of the following
    sequence of bash commands:
       [ $a = ant -a $b = ant ] ; 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

6.  What is the output of the following sequence of bash
    commands:	echo wc >wc ; wc wc >wc ; head wc
    a. 0 0 0 wc
    b. 1 1 3 wc
    c. 1 1 2 wc
    d. no output
    e. wc

7.  What is the output of the following sequence of bash
    commands:	echo hi >wc ; wc wc >hi ; cat hi
    a. 1 1 3 wc
    b. 0 0 0 wc
    c. 1 1 2 wc
    d. no output
    e. hi

8.  What is the output of the following sequence of bash
    commands:	date='Friday March 12' ; test date = date
    a. no output
    b. Fri Mar 12 10:20:39 EST 2004
    c. 1
    d. 0
    e. test: too many arguments

9.  What is the output of the following sequence of bash
    commands:	f=1 ; touch f ; test ! -z $f ; echo $?
    a. 0
    b. 1
    c. the number 1 or 0 followed by another 1 or 0 on a new line
    d. test: $f: integer expression expected
    e. no output

10. What is the output of the following sequence of bash
    commands:	a=sky ; touch $a ; test -z $a ; echo $?
    a. 1
    b. 0
    c. sky
    d. test: $a: integer expression expected
    e. no output

11. What is the output of the following sequence of bash
    commands:	i=0 ; test $i = 00 ; 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




70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-3-		      100 minutes

12. What is the output of the following sequence of bash
    commands:	a=1 ; b=2 ; test $a -ge $b ; 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

13. What is the output of the following sequence of bash
    commands:	x=1 ; y=2 ; test $x -le $y ; echo $?
    a. 0
    b. 1
    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 bash shell output of this two-command sequence:
       cd /etc/passwd && echo "in $(pwd)"
    a. bash: cd: /etc/passwd: Not a directory
    b. in /etc
    c. in 0pwd)
    d. in $(pwd)
    e. no output

15. What is the bash shell output of this two-command sequence:
       cd /bin && echo "echo $(pwd)"
    a. echo /bin
    b. echo 0pwd)
    c. echo $(pwd)
    d. /bin
    e. no output

16. In an empty directory, what is the length of the longest file
    name created by the following bash shell two-command
    sequence:	 var='a ab abc abcd abcde' ; touch '$var'
    a. 4 characters
    b. 3 characters
    c. 2 characters
    d. 1 character
    e. 13 characters

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












70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-4-		      100 minutes

18. If file foo contains nine lines, each of which is the one-
    digit line number of the line in the file (1 through 9), what
    is the output of this command:
       cat foo foo | cat | tail -5 | head -1
    a. 5
    b. 6
    c. 7
    d. 8
    e. 9

19. If file foo contains nine lines, each of which is the one-
    digit line number of the line in the file (1 through 9), what
    is the output of this command:
       cat foo foo | sort -r | head -4 | tail -1
    a. 8
    b. 7
    c. 6
    d. 5
    e. 9

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

21. A shell script named bar is executed as follows:
       ./bar 1 2 "3 4" 5
    Inside the script is the line:   echo "$3"
    What is the output from this line?
    a. 3 4
    b. 2 3 4
    c. "3
    d. $3
    e. 1 2 3

22. If bar is a script containing the line TERM=vt100 ; export
    TERM, what is the output of the following sequence of bash
    commands: TERM=linux ; ./bar ; echo $TERM
    a. linux
    b. vt100
    c. bar
    d. TERM
    e. $TERM












70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-5-		      100 minutes

23. What is the bash shell output of this two-command sequence if
    run in a directory containing 123 files with names that are
    all the numbers from 1 to 123 inclusive:
	 glob="*" ; echo "$glob"
    a. *
    b. $glob
    c. "$glob"
    d. the file names 1 through 123
    e. the file names 1 through 123, surrounded by quotes

24. If bat=12 and cat=99 then which of the following bash command
    lines outputs only the word hi (and nothing else)?
    a. [ bat = bat ] && echo hi
    b. [ bat -ne cat ] && echo hi
    c. [!bat = cat] && echo hi
    d. [bat -eq 12] || echo hi
    e. [bat!=bat] || echo hi

25. How many arguments and options are there to the command:
       wc -l <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.

26. Which correct bash command sequence below always outputs just
    the date only if the first argument is both not empty and a
    directory?
    a. if [ -d "$1" -a -s "$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 [ -s && -d "$1" ]; then date ; fi

27. What is the bash shell output 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

28. What is the bash shell output of this command sequence:
       false && echo "hello	there $?"
    a. no output
    b. hello there 1
    c. hello	 there 0
    d. hello	 there 1
    e. hello there 0







70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-6-		      100 minutes

29. In response to the following bash shell 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"

30. What is the output of this sequence of three shell commands:
       umask 762 ; touch newfile ; ls -l newfile
    a. -------r-- 1 me me 0 Oct 1 1:12 newfile
    b. --------wx 1 me me 0 Oct 1 1:12 newfile
    c. ------xr-x 1 me me 0 Oct 1 1:12 newfile
    d. -rw-rw--w- 1 me me 0 Oct 1 1:12 newfile
    e. -rwxrw--w- 1 me me 0 Oct 1 1:12 newfile

31. What is the output of this sequence of three shell commands:
       umask 457 ; mkdir newdir ; ls -ld newdir
    a. d-wx-w---- 2 me me 512 Oct 1 1:12 newdir
    b. d-w--w---- 2 me me 512 Oct 1 1:12 newdir
    c. d-wx-w-rwx 2 me me 512 Oct 1 1:12 newdir
    d. dr--r-xrwx 2 me me 512 Oct 1 1:12 newdir
    e. dr-xr-xrwx 2 me me 512 Oct 1 1:12 newdir

32. In an empty directory, what is the shell output of these
    three commands:
       touch xx .x xy .y xz ; x='x* y*' ; echo "$x"
    a. x* y*
    b. xx xy
    c. xx xy xz y*
    d. $x
    e. *x *y

33. In an empty directory, what is the shell output of these
    three commands:
       touch .1 .2 .3 11 12 ; a='.1* .2*' ; echo '$a'
    a. $a
    b. .1* .2*
    c. '.1* .2*'
    d. .1 .2
    e. 11 .1 12 .2

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









70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-7-		      100 minutes

35. 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.

36. 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 500 on file dir/bar.
    b. Permissions 100 on directory dir and 200 on file dir/bar.
    c. Permissions 100 on directory dir and 100 on file dir/bar.
    d. Permissions 300 on directory dir and 300 on file dir/bar.
    e. Permissions 500 on directory dir and 400 on file dir/bar.

37. What is the link count of directory dir after this set of
    successful commands?
       mkdir dir ; cd dir ; touch foo ; mkdir a b c
    a. 5
    b. 3
    c. 1
    d. 2
    e. 4

38. What is the link count of file foo after this set of
    successful commands?
    rm foo ; touch foo ; ln foo bar
    cp bar x ; ln x y ; ln bar z ; ln z a
    a. 4
    b. 3
    c. 1
    d. 2
    e. 5

39. Which of the following shell command lines displays all the
    names in the current directory that are exactly three letters
    (alphabetic) long (and nothing else)?
    a. echo [a-zA-Z][a-zA-Z][a-zA-Z]
    b. echo [a-zA-Za-zA-Za-zA-Z]
    c. echo [azAZ][azAZ][azAZ]
    d. echo [a,zA,Z][a,zA,Z][a,zA,Z]
    e. echo ???

40. Which of the following shell command lines displays the names
    in the current directory that are exactly three numeric
    digits long (and nothing else)?
    a. echo [0-9][0-9][0-9]
    b. echo [0-90-90-9]
    c. echo [1-3][1-3][1-3]
    d. echo [1-31-31-3]
    e. echo ???






70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-8-		      100 minutes

41. 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)

42. If file /a contains 40 lines, and file /b contains 60 lines,
    then how many lines are output by this command:
       sort /a /b | cat /a | cat /b
    a. 60
    b. 40
    c. 100
    d. 160
    e. 200

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

44. What is the output of this command sequence:
       echo bat >one ; echo sky | head -2 one
    a. bat
    b. sky
    c. bat followed by sky
    d. sky followed by bat
    e. an error message

45. If directory /dir contains these three four-character file
    names: .123, .124, .???, then what is the output of the
    following bash shell 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

46. 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/??







70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-9-		      100 minutes

47. Which of the following bash PATH statements makes the most
    sense?
    a. PATH=/bin:/usr/bin:/etc
    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

48. Which of the following statements is true about this shell
    command line:  >bar zoom bar haven
    a. The command zoom sees two arguments.
    b. The command zoom sees three arguments.
    c. The command bar sees only two arguments
    d. The command bar sees three arguments.
    e. Error: The command name is missing from the command line.

49. Which command sequence below outputs only lines 10-15 of the
    Unix password file?
    a. head -15 /etc/passwd | tail -6
    b. tail -15 /etc/passwd | head -5
    c. head -15 /etc/passwd | tail -5 /etc/passwd
    d. head -10 /etc/passwd | tail -5 /etc/passwd
    e. tail -10 /etc/passwd | head -15 /etc/passwd

50. Which command sequence below does not generate an error
    message from the last command in the sequence?
    a. mkdir one one/two ; rmdir one/two
    b. mkdir foo ; ln foo bar
    c. date >foo ; cp foo/. bar
    d. cat /etc/passwd > mail idallen@ncf.ca
    e. mkdir foo foo/bar ; rmdir foo

51. If the file bat contained the word foo, what would be the
    bash shell output of this two command sequence:
       PATH=/etc/passwd:/bin/ls:/bin/cat ; /bin/ls bat
    a. bat
    b. foo
    c. /bin/ls: bat: No such file or directory
    d. bash: /bin/ls: command not found
    e. no output

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

53. 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



70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-10-		      100 minutes

54. Which of these first lines will cause this executable file to
    be interpreted using the Bash shell?
    a. #!/bin/bash
    b. #/bin/bash
    c. !#/bin/bash -u
    d. !/bin/bash
    e. /bin/bash -u

55. Which command line below does not show any lines from inside
    the file bat?
    a. ls bat
    b. head bat
    c. tail bat
    d. more bat
    e. less bat

56. Which command line displays the contents of the Unix passwd
    file one page at a time?
    a. less </etc/passwd
    b. less | /etc/passwd
    c. /etc/passwd >less
    d. /etc/passwd | less
    e. cat /etc/passwd >less

57. 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 "... "

58. 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 | echo $1 ]
    d. foo=[ cat -l /etc/passwd ]
    e. foo=[ grep -c /etc/passwd ]

59. If /etc/passwd is a file name, which of the following
    pathnames always leads to the same file?
    a. /../etc/passwd
    b. /etc/passwd/.
    c. /etc/passwd/../..
    d. ./etc/passwd
    e. /etc/../../passwd

60. If my current working directory is /home, and my home
    directory is /home/xx, which of the of the following commands
    copies the Unix password file into my home directory under
    the name foo?
    a. cp xx/../../etc/passwd xx/foo
    b. cp xx/../etc/passwd ../home/xx/foo
    c. cp ../etc/passwd ../xx/foo
    d. cp ../home/xx/../etc/passwd ./xx/./foo
    e. cp ../../etc/passwd /xx/foo



70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-11-		      100 minutes

61. If bar is an executable script containing the line dog=bat
    then what is the bash output of this sequence of three
    commands: dog=cat ; ./bar ; echo "the '$dog' ate"
    a. the 'cat' ate
    b. the 'bat' ate
    c. the '$dog' ate
    d. the $dog ate
    e. the 'dog' ate

62. If happy were a file of text containing 50 different lines,
    what would be the output of this exact command line:
       diff happy happy
    a. no output
    b. an error message because diff only allows one file name
    c. an error message because diff doesn't allow the same file
       name twice
    d. several lines, which are the lines that are different
       between the two files
    e. the contents of file happy would be displayed

63. Which Unix command sequence deletes a directory and
    everything inside it?
    a. rm -r dir
    b. rm -all dir
    c. rmdir -r dir
    d. rmdir -all dir
    e. deltree -all dir

64. Which of the command lines below can generate a non-empty
    file?
    a. ls /out >/out
    b. sort -r /out >/out
    c. tail -5 /out >/out
    d. tr abc ABC </out >/out
    e. grep -v /out /out >/out

65. What is the bash shell output of this two command sequence:
       PATH=/bin/ls:/bin/head:/bin/sh ; head nosuchfile
    a. bash: head: command not found
    b. bash: /bin/ls: command not found
    c. ls: /bin/head: command not found
    d. head: nosuchfile: No such file or directory
    e. bash: /bin/sh: No such file or directory

66. What is the output of this sequence of three shell commands:
       echo x >abc ; ls >abc abc ; wc abc
    a. 1 1 4 abc
    b. 1 1 3 abc
    c. 1 1 2 abc
    d. 0 0 0 abc
    e. no output









70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-12-		      100 minutes

67. How can you ask the bash shell to complete commands or file
    names for you?
    a. You can type the first part of the command or file name
       and press the TAB key.
    b. You can type the first part of the command or file name
       and press the ALT key.
    c. Type [CONTROL]-[ALT]-[DEL] and the shell will present a
       menu of commands.
    d. Type [CONTROL]-[D] and the shell will present a menu of
       commands.
    e. Type [ALT]-[F2] the shell will present a menu of commands.

68. Given this long listing:
       drwxr-xr-x 448 me me 296 Dec 4 9:12 /dir
    How many subdirectories lie immediately under /dir?
    a. 446
    b. 448
    c. 294
    d. 296
    e. there is not enough information shown to answer the
       question

69. 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-

70. 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






















70 Questions	     DAT2330 Unix Final - 30%	      100 minutes



DAT2330 - Ian Allen - Winter 20-13-		      100 minutes

Answer Key - DAT2330 - Ian Allen - Winter 2004 - DAT2330 Unix
			   Final - 30%

Office use only: 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 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
64 65 66 67 68 69 70
   1. a				     49. a
   2. a				     50. a
   3. a				     51. a
   4. a				     52. a
    5. a			      53. a
    6. a			      54. a
    7. a			      55. a
    8. a			      56. a
   9. a				     57. a
  10. a				     58. a
  11. a				     59. a
  12. a				     60. a
   13. a			      61. a
   14. a			      62. a
   15. a			      63. a
   16. a			      64. a
  17. a				     65. a
  18. a				     66. a
  19. a				     67. a
  20. a				     68. a
   21. a			      69. a
   22. a			      70. a
   23. a
   24. a			   Count of a:	70  100%
  25. a
  26. a				   With 5 choices: 70
  27. a				    1 2 3 4 5 6 7 8 9 10 11 12 13
  28. a				    14 15 16 17 18 19 20 21 22 23
   29. a			    24 25 26 27 28 29 30 31 32 33
   30. a			    34 35 36 37 38 39 40 41 42 43
   31. a			    44 45 46 47 48 49 50 51 52 53
   32. a			    54 55 56 57 58 59 60 61 62 63
  33. a				    64 65 66 67 68 69 70
  34. a
  35. a				   Macro .cmd splits: 27
  36. a				   Macro .ans splits: 0
   37. a
   38. a
   39. a
   40. a
  41. a
  42. a
  43. a
  44. a
   45. a
   46. a
   47. a
   48. a





70 Questions	     DAT2330 Unix Final - 30%	      100 minutes