Change that alters the current working directory.

Tells the shell to continue executing.

Tells the shell it should exit immediately with the provided exit code.

Change that sets an environment variable (ex. export ENV_VAR=VALUE)

Change that sets a shell variable (ex. ENV_VAR=VALUE)

Change that deletes the environment variable (ex. unset ENV_VAR).

Change that alters the environment.

Result of executing a custom command.