Bash Programming : Addition

Here I tried this on ubuntu

To create the file

code type in the terminal:

don’t give space after or before equal sign

save the file and close editing mode:

change the permission of this file:

to show the output

Shortcut method for addition or any other:
create a file with cat then type code from the below in one line

here 1 2 and 3 is variable is taking input from user and also giving teh output so we sue $ before them….it is the shortcut method

then just type

and you will get the addition of this variables