How to declare global variables?

In a shell script, you can declare global variables by simply defining them outside of any functions. By default, variables declared in a script are global unless they are declared as local within a function. Here's how to declare global variables:

1. Declare the Variable: Assign a value to the variable at the top level of the script.

   global_var="I am a global variable"

2. Access the Global Variable: You can access this variable from anywhere in the script, including inside functions.

   echo $global_var

3. Example Script:

   #!/bin/bash
   
   # Declare a global variable
   global_var="I am a global variable"
   
   # Function to access the global variable
   function print_global {
       echo $global_var
   }
   
   # Call the function
   print_global

In this example, global_var is accessible both in the main body of the script and within the print_global function.