What is the purpose of /dev/null ? This is an empty file used as the filesystem

Question

What is the purpose of /dev/null ?

This is an empty file used as the filesystem template for new files

This is a special directory used for source code development files

This file is a system device called a bit bucket which accepts input and does nothing with it.

This is a device file that maps to the zero key on the keyboard

QUESTION 3

You have a directory named "CIS003" that has some files in it. You want to delete the directory and all the contents. What command would you type?

rmdir CIS003

del -R CIS003/*

rm -r CIS003

rmdir -all CIS003

QUESTION 4

In most Unix command line interfaces, which key can you press to get to a previously typed command (command history)?

Shift + Enter

Up Arrow

ESC Key

Space Key

QUESTION 7

If your current working directory is /usr, which of the following commands would bring you to the /usr/bin directory? (there might be more than one right answer)

cd ..

cd /usr/bin

cd bin

cd ./bin

QUESTION 8

Which command is used to search the contents of a file for lines that contain a particular pattern?

grep

ls

tee

wc

QUESTION 10

You want to create a symbolic link named "docs" in your home directory that points to /usr/share/doc

What command would you type to create that symbolic link?

ln -s docs /usr/share/doc/

ln -s /usr/share/doc/ docs

ln /usr/share/doc/ -> docs

lnk -s /usr/share/doc/ .

QUESTION 14

Which of the following commands will bring you to your home directory (there might be more than one)?

cd

cd /

cd $HOME

cd ~

QUESTION 17

When using the vi text editor to edit a file, why can you just start typing away right after opening the file?

Vi takes a minute at startup to verify the file syntax.

Vi needs to be told if the file is ascii or binary after opening the file.

Vi starts in read-only mode by default.

Vi is a modal text editor, and is in command mode by default when first opened.

QUESTION 20

Which command would you type to view all connected filesystems in Unix?

lm -a

ls /

ps axm

mount

a.

This is an empty file used as the filesystem template for new files

b.

This is a special directory used for source code development files

c.

This file is a system device called a bit bucket which accepts input and does nothing with it.

d.

This is a device file that maps to the zero key on the keyboard

QUESTION 3

You have a directory named "CIS003" that has some files in it. You want to delete the directory and all the contents. What command would you type?

a.

rmdir CIS003

b.

del -R CIS003/*

c.

rm -r CIS003

d.

rmdir -all CIS003

Explanation / Answer

1) option a (This is an empty file used as the filesystem template for new files).

3) option c (rm -r CIS003) - where rm command deletes files and with option r deletes directiories and all files in it

4) oprtion b (uparrow) - when we want recently commands then we can use uparrow to get those commands.

7) option b and c - (cd /usr/bin and cd bin) - option b we are sending the absolute path of directory so it directly move to specified directory and option c assumes you are in /usr directory so it goes to bin folder inside of it.

8) option a (grep) - it is used to search for text in the files using regular expressions

10) option b (ln -s /usr/share/doc docs) - first is soucefile and second file is name you want to create shortcut

14) option a, c and d (cd , cd $HOME and cd ~) - these all commands can change you to home directory.

17) option d (Vi is a modal text editor, and is in command mode by default when first opened.)

20) option b (ls /) - to view all connected file systems in UNIX

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