What is the function of the command 'export' in Shell Scripts?

The command 'export' in Shell Scripts is used to mark a variable for export, which makes it available to child processes that the shell starts. When a variable is exported, it becomes part of the environment for any subsequently executed commands or scripts, allowing those child processes to access and use the variable.

This is particularly important in scripting and multi-process environments, as it ensures that necessary configuration or data stored in the variable is correctly passed to other scripts or applications that rely on it. Without using 'export', a variable declared in a shell script would not be accessible by any child processes that the script starts.

The other options do not accurately describe the function of the 'export' command. Running a script is typically done through other commands like 'bash' or by executing the script directly. Displaying the environment can be done using other commands such as 'env' or 'printenv'. Setting a new variable is accomplished by assignment (e.g., VAR=value) rather than the export command itself.