After you've logged in, the system automatically runs the /home/username/.profile script.
This script lets you customize your working environment without affecting other users. For more information, see Configuring Your Environment.
To change your password:
Use the passwd command. This utility prompts you for your current and new passwords; see "Managing your own account" in Managing User Accounts.
To log in as a different user:
Enter login at the command prompt, and then enter the user's name and password.
To determine your current user name:
Use the id command.