How do I use variables in shell scripts?

How do I use variables in shell scripts?

You can define a variable in a shell script by using the syntax: variable_name=value. For example, name=John.

How do I access the value of a variable?

To access the value of a variable, use the $ sign before the variable name. For example, echo $name will output 'John'.

Can I use variables in command substitutions?

Yes, you can use variables in command substitutions. For example, current_date=$(date) assigns the current date to the variable current_date.

What about using variables in loops?

You can use variables in loops as well. For instance, in a for loop, you can do: for i in 1 2 3; do echo $i; done.