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## 1.2.2 Job Control

GMT programs may get operational parameters from several places:

1. Supplied command line options/switches or program defaults.

2. Short-hand notation to select previously used option arguments (stored in .gmtcommands4).

3. Implicitly using GMT defaults for a variety of parameters (stored in .gmtdefaults4).

4. May use hidden support data like coastlines or PostScript patterns.

Next: 1.2.3 Output data Up: 1.2 The GMT environment: Previous: 1.2.1 Input data Contents Index