How can I use variables in Bash?

In Bash, you can use variables to store data that you can reference later in your script. Here's how to define and use variables:

Defining a Variable

To define a variable, simply assign a value to it without spaces around the = sign:

my_variable="Hello, LabEx"

Accessing a Variable

To access the value of a variable, prefix it with a $ sign:

echo $my_variable

Example

Here’s a complete example:

#!/bin/bash

# Define a variable
greeting="Hello, LabEx"

# Use the variable
echo $greeting

Notes

• Variable names can include letters, numbers, and underscores, but cannot start with a number.
• By convention, variable names are usually written in uppercase.

Feel free to ask if you need more details or examples!