linux unix 2

1.

1 point

Which special BASH variable indicates the number of command line arguments passed to the script?

$#

$*

$?

$@

2.

1 point

In BASH, strings and numbers are compared the same way.

True

False

3.

1 point

To enter insert mode in the vi editor, we can use:

: key

i key

j key

ESC key

4.

1 point

Which operator sends the output from A into B while both programs are executing?

|

>

>>

<

5.

1 point

Which file has the permissions 664?

-rwxrwxr-x 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

--w--w---- 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

-rw-rw-r-- 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

-r--r--r-- 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

6.

1 point

Which sequence in vi will quit the text editor without saving?

:q!

:wq

:q

wq

7.

1 point

The proper syntax to compare whether the string value of Variable X is greater than or equal t the string value of Variable Y is:

[X>=Y]

[ $X - ge $Y ]

[$X - ge $Y]

[ $X>=$Y ]

8.

1 point

Examine the code below:

#!/bin/bash

count=0
str=""
while [ $count -lt 10 ] ; do
str=$str-$count
let count=count+1
done
echo $str

How will the code be affected if we change the line: let count=count+1 ... to ... let $count=count+1?

No output will be produced

Output will change due to different data type being used

An error will result due to improper use of variables

The output will be the same in both cases

9.

1 point

If the file foo.sh had 664 permissions, issuing
chmod +x foo.sh
would give the file ____ permissions

444

664

775

440

10.

1 point

Which of the following files is executable?

-rwxrwxr-x 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

-r--r--r-- 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

-rw-rw-r-- 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

--w--w---- 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

11.

1 point

Given the following code segment:

FOO="boo"
BAR=2323

What will be the output when the following statement executes:

echo "moo${FOO}/${BAR}${BAR}"

moomoo/2323

moofoo/barbar

mooboo/2323

moo${FOO}/${BAR}${BAR}

12.

1 point

Which test determines whether the file f1.txt is a directory?

[ -d f1.txt ]

[ -O f1.txt ]

[ -f f1.txt ]

[ -e f1.txt ]

13.

1 point

Which test determines whether the file f1.txt is a plain file?

[ -d f1.txt ]

[ -O f1.txt ]

[ -e f1.txt ]

[ -f f1.txt ]

14.

1 point

BASH is not capable of simple arithmetic operations.

True

False

15.

1 point

Given the following code segment:

FOO="boo"
BAR=2323

What will be the output when the following statement executes:

echo 'moo${FOO}/${BAR}${BAR}'

moomoo/2323

moo${FOO}/${BAR}${BAR}

moofoo/barbar

mooboo/2323

16.

1 point

Which special BASH variable can be used to view all command line arguments u-quoted?

$#

$*

$?

$@

17.

1 point

Which sequence in vi will quit the editor and save the file being edited?

:wq

:q!

:q

wq

18.

1 point

Which script will list individual words of a text file, such that one word is displayed per line?
Assume the text file comes in as a command line argument.

cat $1

for word in $(cat $1) ; do echo $word done

for word in $1 ; do echo $word done

for word in $($1) ; do echo $word done

19.

1 point

Because of variable substitution, in BASH variables can be embedded in any string.

True

False

20.

1 point

What will be the output when the code below executes:

#!/bin/bash

count=0
str=""
while [ $count -lt 10 ] ; do
str=$str-$count
let count=count+1
done
echo $str

-0-1-2-3-4-5-6-7-8-9

-0-1-2-3-4-5-6-7-8-9-10

0 1 2 3 4 5 6 7 8 9 10

An error will result due to the line: str=$str-$count

21.

1 point

Assume a script dumpThem.sh was called as:

./dumpThem.sh first second third fourth

What will be printed if the following code executes?

echo "$2$1"$4 $3

second first fourth third

secondfirst fourth third

secondfirstfourththird

secondfirstforth third

22.

1 point

Which file has permissions 775?

--w--w---- 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

-rwxrwxr-x 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

-r--r--r-- 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

-rw-rw-r-- 1 sysadmin sysadmin 20 May 4 19:30 shtest1.sh

23.

1 point

In BASH, variables are implemented as names of the memory locations where values are stored.

True

False

24.

1 point

BASH commands can only be executed from a script file.

True

False

25.

1 point

Which test determines whether the file f1.txt exists

[ -d f1.txt ]

[ -e f1.txt ]

[ -f f1.txt ]

[ -O f1.txt ]

26.

1 point

Given the following code:

#!/bin/bash

What does that indicate?

Process the following script with the Bourne shell

Process the following script with the default shell

Process the following script with the Bourne Again shell

Process the following script with Perl

27.

1 point

What will be the output of the command:

sysadmin@localhost:~$ cal

Sun May 4 19:18:03 UTC 2014

May 2014 Su Mo Tu We Th Fr Sa 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

Sun May 4 19:18:03 UTC 2014 Sun Mon Tue Wed Thu Fri Sat 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

May 2014 Sun Mon Tue Wed Thu Fri Sat 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

28.

1 point

It is much easier to export our work from VMWare than from Netacad.

True

False

29.

1 point

Which special BASH variable can be used to view the return code of the last command/program executed?

$#

$?

$*

$@

30.

1 point

Examine the code below:

#!/bin/bash

count=0
str=""
while [ $count -lt 10 ] ; do
str=$str-$count
let count=count+1
done
echo $str

How will the code be affected if we change the line: let count=count+1 ... to ... let count=$count+1?

Output will change due to different data type being used

An error will result due to improper use of variables

The output will be the same in both cases

No output will be produced

31.

1 point

What will be the output of the command:

sysadmin@localhost:~$ echo $(cal)

issued Sunday 5/4/2-14

May 2014 Sun Mon Tue Wed Thu Fri Sat 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

cal

May 2014 Su Mo Tu We Th Fr Sa 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

blank - no output

32.

1 point

In BASH, a variable holding a numeric value can be treated just like a string.

True

False

33.

1 point

Which is equivalent to: while [ $X -lt 10 ]

until [ $X -ge 10]

while [ $X -le 10 ]

until [ $X > 10 ]

until [ $X -gt 10 ]

34.

1 point

What will be the output of the command:

sysadmin@localhost:~$ echo cal

cal

blank - no output

May 2014 Sun Mon Tue Wed Thu Fri Sat 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

May 2014 Su Mo Tu We Th Fr Sa 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

35.

1 point

To enter command mode in vi editor, we use:

ESC Key

i Key

: Key

j Key

36.

1 point

Which command(s) will prompt the user to enter his/her age, such that the age is entered on the same line as the prompt?

echo "Please enter your age: " read age

echo "Please enter your age: " read $age

read -p "Please enter your age" $age

read -p "Please enter your age" age

37.

1 point

A command embedded in a string, will be replaced with its output, when the string is processed.

True

False

38.

1 point

$(foo) is equivalent to:

`foo`

$foo

"foo"

${foo}

39.

1 point

The proper syntax to compare whether the numeric value of variable X is greater than or equal to the numeric value of Y is:

[$X -ge $Y]

[ $X -ge $Y ]

[X>=Y]

[ $X>=$Y ]

40.

1 point

What will be the output of the following command:
sysadmin@localhost:~$ echo ${cal}

blank - no output

May 2014 Su Mo Tu We Th Fr Sa 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

cal

May 2014 Sun Mon Tue Wed Thu Fri Sat 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

41.

1 point

We would like to assign a value of 25 to the variable x. Which BASH statement will correctly accomplish that?

$x = 25

x=25

x = 25

$x=25

42.

1 point

If a BASH command does not execute successfully, it returns zero.

True

False

43.

1 point

If you have a script, myScript.sh, which is executed as:

./myScript.sh one two three four five

and there is a line of code:

echo "$# $@"

what will be output to the screen?

5 one two three four five

one

5 one

one two three four five

44.

1 point

Which return codes of a program are evaluated as true in BASH?

zero

not one

one

not zero

45.

1 point

Which is equivalent to: until [ $X =gt 10 ]

until [ $X -ge 10 ]

until [ $X >= 10 ]

while [ $X -le 10 ]

while[ $X -gt 10 ]

46.

1 point

To allow a script to execute like a command we must __________.

ensure that the file containing the script is executable.

ensure that the script always starts with #!/bin/bash.

ensure that the file containing the script is executable and in the directory that is in the search path.

ensure that the file containing the script is in the directory that is in the search path.

47.

1 point

Which special BASH variable ca be used to view all command line arguments, quoted?

$@

$*

$#

$?

48.

1 point

Which of the following files will not allow any access to the user who are not the owner and are not in the owner's group?

-rw-rw-r-- 1 sysadmin sysadmin 20 may 4 19:30 shtest1.sh

--w--w---- 1 sysadmin sysadmin 20 may 4 19:30 shtest1.sh

-r--r--r-- 1 sysadmin sysadmin 20 may 4 19:30 shtest1.sh

-rwxrwxr-x 1 sysadmin sysadmin 20 may 4 19:30 shtest1.sh

49.

1 point

${foo} is equivalent to:

"foo"

`foo`

$foo

$(foo)

50.

1 point

White space is important in BASH syntax.

True

False