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# General features

This section explains a few features common to all the programs in GMT. It summarizes the philosophy behind the system. Some of the features described here may make more sense once you reach the cook-book section where we present actual examples of their use.

- GMT Units
- GMT defaults
- Command Line Arguments
- Standardized command line options
- Command Line History
- Usage messages, syntax- and general error messages
- Standard Input or File, header records
- Verbose Operation
- Output
- PostScript Features
- Landscape and Portrait Orientations
- Overlay and Continue Modes
- Specifying pen attributes
- Specifying area fill attributes
- Color palette tables
- Character escape sequences
- Embedded grdfile format specifications
- Binary table i/o