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Tuning the user environment
 1. Introducing "fortune"
2. .bash_profile
3. The login shell
4. Understanding --login
5. Testing for interactivity
6. /etc/profile and /etc/skel
7. export
8. Marking variables for export
9. Export and set -x
10. Setting variables with "set"
11. Unset vs. FOO=
12. Exporting to change command behavior
13. Using "env"
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