The following control characters are supported:
- \a
- Alarm. Causes the terminal to generate an audible beep.
- \b
- Backspace. Backs up the output position by one byte. If you
are at the start of the record, you cannot back up to previous record,
and backspace is ignored.
- \f
- Form feed. Sends any unwritten data to the terminal and clears
the screen if the environment variable _EDC_CLEAR_SCREEN is set. If
the variable is not set, the \f character is written to
the screen.
- \n
- New-line. Sends the preceding unwritten character to the terminal.
If no preceding data exists, it sends a single blank character.
- \t
- Horizontal tab. Pads the output record with blanks up to the
next tab stop (set at eight characters).
- \v
- Vertical tab. Placed in the output as is.
- \r
- Carriage return. Treated as a new-line, sends preceding unwritten
data to the terminal.