public/subjects/devops/set-internal-vars

set-internal-vars

Instructions

Create a script set-internal-vars.sh, which will allow you to create and print the following variables.

• MY_MESSAGE which contains the string "Hello World".
• MY_NUM which contains the number 100.
• MY_PI which contains the number 3.142.
• MY_ARR which contains (one two three four five)

Expected output:

$ ./set-internal-vars.sh
Hello World
100
3.142
one, two, three, four, five
$

Hints

Creating variables:

Variables can be created either at the shell or in shell-scripts. Any variable created within a shell script is lost when the script stops executing. A variable created at the prompt, however, will remain in existence until the shell is terminated. The syntax for creating a variable is :

<variable name>=<value>

If we type the set command without any additional parameters, we will get a list of all shell variables, environmental variables, local variables, and shell functions.

Use the unset command to remove a variable from your shell environment.

$ MyVar=8472
$ echo $MyVar
8472
$ unset MyVar
$ echo $MyVar

$

You have to use Man or Google to know more about commands flags, in order to solve this exercise! Google and Man will be your friends!