gmt-fork/doc/rst/source/explain_-ocols_full.rst_

.. _-ocols_full:

**-o**\ *cols*\ [,...][,\ **t**\ [*word*]]
    Select specific data columns for primary output, in arbitrary order. Columns
    not listed will be skipped. Give columns (or column ranges
    in the format *start*\ [:*inc*]:*stop*, where *inc* defaults to 1 if
    not specified) separated by commas.  Columns may be repeated.
    To write from a given column until the end the columns, leave off *stop*.
    [Default writes all columns in order].
    Normally, any trailing text in the internal records will be written but
    when **-o** is used you must explicitly add the column **t**. To only output a single word from the
    trailing text, append the word number (first word is 0).  Finally, **-on** will
    simply write the numerical output only and skip any trailing text, while **-ot**
    will only output the trailing text (or selected word).  **Note**: If **-i** is
    also used then columns given to **-o** correspond to the order *after* the **-i** selection
    and not the columns in the original record.