Directories, files and Redirection

Question 1

What is an alias?

Answer 1

Alias gives a command an alias name to use, only around during your current shell however you can save it in the startup file, however other currently running shells will have to be restarted to get that configuration

Question 2

What is one limitation for a alias?

Answer 2

cannot put any variable information into the alias

Question 3

What are the values in “drwr-xr 2 jacob jacob 4096 Jan 10 16:40 bin” for

Answer 3

–first set of values indicates the file type d is a folder, and - is a normal file.

–After the D or - the r, rw, x, indicates permissions.
R - read,
RW - read and write,
x - execute
–number is a link count
–Next information is the owner, then group
–number is the size of the file or folder
–date and time of last modification
–Last is the name of the file or folder

Question 4

What option would you use with ls command to show you hidden files/folders

Answer 4

-a, those files start with a .

Question 5

What option would you use with ls to show the file size in bytes?

Answer 5

-li

Question 6

What does the mkdir command do?

Answer 6

makes a directory

Question 7

What does the cd command do?

Answer 7

changes the directory, followed by the directory name

Question 8

What does the touch command do?

Answer 8

creates and empty file

Question 9

What does the rm command do?

Answer 9

removes a file

Question 10

What does the cd.. command do?

Answer 10

takes you back one level

Question 11

What does the rmdir command do?

Answer 11

removes a directory

Question 12

What does the pwd command do?

Answer 12

print working directory

Question 13

What does the cd - command do?

Answer 13

takes you back to where you last were

Question 14

What does the cd command do with no other input?

Answer 14

takes you home, cd~ also takes you home

Question 15

What does the cd~/bin command do?

Answer 15

takes you to the home and then to the bin directory, replace bin for any other directory

Question 16

What does the cat command do?

Answer 16

shows you the content of the string

Question 17

What does the cp command do? What would the structure look like?

Answer 17

copies a file. Two ways of using this command.

1. Moving a file to a new folder cp file /tmp, where /tmp is the new location and file is the name of the file you are moving
2. Renaming a file, cp file file2, where file is the file to be copied and file2 is the new name

Question 18

What does the mv command do? What would the structure look like?

Answer 18

mv moves files, renames files,

1. moving a file, mv file /tmp
2. moving and renaming, mv file /tmp/new-name

Question 19

Absolute Path

Answer 19

Always starts with the root, example cd /etc/init.d as opposed to the relative path cd ../../etc/init.d

Question 20

Realative Path

Answer 20

../../etc.init.d as opposed to the absolute path /etc/init.d