How to use variables in a BASH shell script
Here’s how to use simple variables in BASH shell scripts. It appears there are no data types, and everything’s a string (correct me if I’m wrong). We can define a variable by first setting it to a value, then later refer to that value with a dollar sign in front of the variable name.
Here’s an example:
#!/bin/bash VARIABLE="Testing" echo $VARIABLE
Note that there are no spaces between the variable name, the equal sign or the value. Adding those will result in a runtime error.
Variables can be defined in upper or lower case letters, or a combination thereof.
BASH Variables have a global scope, unless they are prefaced with the local keyword inside functions (in which case, only said function will have access to its value).