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ou -- Option Unprintable
default range syntax
1,$ ou[character]
The "u" option is for monitoring unprintable characters.
Typing "ou" by itself will return the current character used
to display unprintable characters. If it is ' ' (blank), then
unprintable characters are not checked and may mess up the
display. Typing "oux" where "x" is a printable character will
turn on character checking and display "x" everytime an
unprintable character is encountered. Unprintable characters
are not disturbed in the file, but can be "edited" out.
See also hccmisc for refreshing the display.
For general information about the option command, type "ho".