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Environment Customization
Like the Bourne shell, bash uses the file /etc/profile for system-wide customization. When a user logs in, the shell reads and runs /etc/profile before running the user's .bash_profile.
We won't cover all the possible commands you might want to put in /etc/profile. But bash has a few unique features that are particularly relevant to system-wide customization; we'll discuss them here.
We'll start with two built-in commands that you can use in /etc/profile to tailor your users' environments and constrain their use of system resources. Users can also use these commands in their .bash_profile, or at any other time, to override the default settings.
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