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4.7 Standard Input or File, header records
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<P>
Most of the programs which expect table data input can read
either standard input or input in one or several files.
These programs will try to read <I>stdin</I> unless you type
the filename(s) on the command line without the above hyphens.
(If the program sees a hyphen, it reads the next character
as an instruction; if an argument begins without a hyphen,
it tries to open this argument as a filename).
This feature allows you to connect programs with pipes if
you like. If your input is ASCII and has one or more header
records, you must use the <B>-H</B> option. The number of header
records is one of the many parameters in the <U>.gmtdefaults</U>
file, but can be overridden by <B>-H</B><I>n_header_recs</I>.
ASCII files may in many cases also contain sub-headers
separating data segments; see Appendix B for complete
documentation. For binary table data no headers are allowed.
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<ADDRESS>
Paul Wessel
2001-04-18
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