Chapter 5 - CLI skills

Question 1

What is the difference between an Alias and Variable?

Answer 1

Variable stores data in the form of strings.
Alias is a shortcut for a longer command

Question 2

-How do you create a local variable?
-And how do you view its value in CLI?

Answer 2

-variable=value
-echo $variable

Question 3

-How do you create an Environment variable?
-And how do you view its value in CLI?

Answer 3

• export variable
  -env | grep variable

Question 4

How do you remove an exported ENV variable?

Answer 4

unset variable

Question 5

What is the purpose of the which command?

Answer 5

Used to determine if there is an executable file, in this case named date, that is located within a directory listed in the PATH value.

output is a file path –>

sysadmin@localhost:~$ which date
/bin/date

Question 6

what directories store external commands in linux?

Answer 6

externals are generally stored in /bin, /usr/bin, or /usr/local/bin.

Question 7

W

Question 8

What is the difference between a built-in program and an executable?

Answer 8

A builtin is a command or function that is executed directly in the shell itself.

An external executable program is loaded by the shell and then executed.