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Bash Quiz

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Bash Quiz

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1. Given a directory with these seven files, what would remain after executing these commands?
'''bash
archive.tar
image1.gif
image1.jpg
image2.gif
image2.jpg
textfile1.txt
textfile2.txt
----------
'shopt -s extglob
rm !(*gif|*jpg)'

b'''basharchive.tartextfile1.txttextfile2.txtd:'''bashimage1.gifimage1.jpgimage2.gifimage2.jpg'''cAll of this files will be deleteda'''basharchive.tarimage1.gifimage1.jpgimage2.gifimage2.jpgtextfile1.txttextfile2.txt

2. To run a group of commands without spawning a subshell, which syntax would you use?

{ command1; command2; }(( command1; command2 ))command1; command2 )sh command1; command2

3. Which one is true?

None of theseSELinux policy rules are never checked after DAC rules.SELinux policy rules are checked before DAC rulesSELinux policy rules are checked after DAC rules.

4. Using Bash extended globbing, what will be the output of this command?
'''bash
$ ls -l
apple
banana
bananapple
banapple
pineapple
strawberry
$ shopt -s extglob
$ ls -l @(ba*(na)|a+(p)le)

b'''bashapplebananabananapplebanapplepineapplestrawberrya'''bashapplebananac'''bashapplebananabananappplebanapplepineappled'''bashapplebananabananapplebanapplepineapple'''

5. What does this script accomplish?
'''bash
#!/bin/bash
declare -A ARRAY=([user1]=bob [user2]=ted [user3]=sally)
KEYS=(${!ARRAY[@]})
for (( i=0; $i < ${#ARRAY[@]}; i+=1 ));do
echo ${KEYS[$i]} - ${ARRAY[${KEYS[$i]}]}
done

Using a C-style for loop, it loops through the associative array named ARRAY using the associative array's keys and outputs both the key and values for each item.It creates an indexed array of the associative array named ARRAY. It then uses a C-style for loop and the indexed array to loop through all items in the associative array, outputting the key and value of each array item using the index number.It creates an associative array named ARRAY, which it loops through using a C-style for loop and the index numbers of each item in the associative array's keys, outputting the value of each item.It sorts the associative array named ARRAY and stores the results in an indexed array named KEYS. It then uses this sorted array to loop through the associative array ARRAY.

6. What is the output of this code?
'''bash
VAR='/var/www/html/website.com/html/'
echo '${VAR#*/html}'

'/html/website.com/html/'Nothing will be echoed on the screen.'/var/www/html/website.com/''/website.com/html/'

7. Which does the below command do?
'''bash
w

It doesn't display information about the users currently on the machine.It displays information about the users currently on the another machine.It displays information about the users currently on the machine.None of these

8. How would you find the last copy command run in your history?

grep cp historyhistory | find cphistory | grep cpcp history

9. What is the result of this script?
'''bash
txt=Penguins
[[ $txt =~ [a-z]{8} ]]; echo $?

0, representing 'true', because the variable 'txt' contains eight letters0, representing 'true', because everybody loves penguins!1, representing 'false', because the variable 'txt' does not contain eight lowercase letters between a and z1, representing 'false', because the variable 'txt' is longer than eight characters

10. What is the result of this script?

It removes the directory 'foo' and the files contained within it.It removes all files except those in the current directory.It removes all files in the current directory.It removes all files except those in the 'foo' directory.

11. How would you change your Bash shell prompt to the following?
'''bash
HAL>

'SHELL='HAL\>'''PS1='HAL\>'''SHELL='HAL>'''export PS1='HAL>''

12. How could you get a list of all .html files in your tree?

'find . -name \*.html -print''find . -type html''find *.html''find . -name *.html'

13. Which statement will print all of the fully qualified .cvs files in the home directory or subdirectories while not displaying any errors?

find $HOME -name '\*.csv' 2>/dev/nullfind $USER_DIR -name '\*.csv' 2>/dev/nullfind HOME -name '\*.csv' 1>/dev/nullfind $HOME -name '\*.csv' 1>/dev/null

14. What statement would you use to print this in the console?
'Shall we play a game? yes\no'

'echo 'Shall we play a game\? yes\\no'''echo 'Shall we play a game? yes\no'''echo 'Shall we play a game? yes\\no'''echo 'Shall we play a game? yes/\no''

15. What does the asterisk represent in this statement?
'''bash
#!/usr/bin/env bash
case $num in
1)
echo 'one'
; ;
2)
echo 'two'
; ;
*)
echo 'a mystery'
; ;
esac

a case only for what happens when the asterisk character is passed into the scriptan action that is taken for any input, even if it matches a specified conditionthe action of all of the other cases combined togethera case that matches any value, providing a default option if nothing else catches that value

16. Wich operator sends the output of ls to a file for later use?

ls < filelist.txtls - filelist.txtls ¦ filelist.txtls > filelist.txt

17. How does the SUID or setuid affect executable commands?

When the command is executed, its running privileges elevate to the user owner of the command.The SUID bit allows anyone to execute the command no matter what other permissions are set.When the command creates files, they will be owned by the group owner of the command.When the command is executed, its running privileges elevate to the group owner of the command.

18. The shell looks at the contents of a particular variable to identify which programs it can run. What is the name of this variable?

$INCLUDE$PATH$PATHS$PROGRAM

19. What are the results of the command with a user named jon?
'''bash
echo 'Hello, $(whoami)!'

Hello, jon!Hello, $(whoami)!Hello, $(jon)!Hello, whoami!

20. Which of the three methods will copy the directory named 'photo dir' recursively from the user's home directory to /backups?
'''bash
cp -R '~/photo dir' /backups #method1
cp -R ~'/photo dir' /backups #method2
cp -R ~/'photo dir' /backups #method3

Only method 2 will expand ''~/'' to the user's home directory and then append the quoted directory name that includes a space.None of the three methods will expand to the user's home directory. Only using ''$HOME/photo dir''will be successful.Only method 1 will expand ''~/'' to the user's home directory and then append the quoted directory name that includes a space.Only method 3 will expand ''~/'' to the user's home directory and then append the quoted directory name that includes a space.

21. Which statement checks whether the variable num is greater than five?

'(( \$num -gt 5 ))''[[$num -lt 5]]''\$num > 5''(( \$num > 5 ))'

22. In order for a Bash script to be executed like an OS command, it should start with a shebang line. What does this look like?

'#!/usr/bin/env bash''~/usr/bin/env bash''#/usr/bin/env bash'''$!/usr/bin/env bash'

23. To make a Bash script named script.sh executable, what should you run?

chmod +x script.shexec script.shbash script.shsource script.sh

24. What will be the output of this script?

'C'

'B'

'D'

25. For the script to print 'Is numeric' on screen, what would the user have to enter when prompted?
'''bash
#!/bin/bash
read -p 'Enter text ' var
if [[ '$var' =~ '^[0-9]+$' ]];then
echo 'Is numeric'
else
echo 'Is not numeric'
fi

One or more characters that only includes integersDue to a syntax error it is impossible to get the script to print 'Is numeric'Any sequence of characters that includes an integerThe user would have to enter the character sequence of '^[0-9]]+$' Only this will prove to be true and 'Is numeric' would be printed on the screen due to incorrect syntax. By encapsulating the regular expression in double quotes every match will fail exce

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About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | OSHA Basics Quiz | What Should We Know?
Privacy | Terms |

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