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(libc.info)Output Modes

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Output Modes
------------

   This section describes the terminal flags and fields that control how
output characters are translated and padded for display.  All of these
are contained in the `c_oflag' member of the `struct termios' structure.

   The `c_oflag' member itself is an integer, and you change the flags
and fields using the operators `&', `|', and `^'.  Don't try to specify
the entire value for `c_oflag'--instead, change only specific flags and
leave the rest untouched (Note: Setting Modes).

 - Macro: tcflag_t OPOST
     If this bit is set, output data is processed in some unspecified
     way so that it is displayed appropriately on the terminal device.
     This typically includes mapping newline characters (`'\n'') onto
     carriage return and linefeed pairs.

     If this bit isn't set, the characters are transmitted as-is.

   The following three bits are BSD features, and they exist only BSD
systems and the GNU system.  They are effective only if `OPOST' is set.

 - Macro: tcflag_t ONLCR
     If this bit is set, convert the newline character on output into a
     pair of characters, carriage return followed by linefeed.

 - Macro: tcflag_t OXTABS
     If this bit is set, convert tab characters on output into the
     appropriate number of spaces to emulate a tab stop every eight
     columns.

 - Macro: tcflag_t ONOEOT
     If this bit is set, discard `C-d' characters (code `004') on
     output.  These characters cause many dial-up terminals to
     disconnect.