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oh -- Option Hardware Insert/Delete
default range syntax
1,$ oh
The "h" option controls the use of hardware line
insert/delete on terminals that have that capability. By
default, line insert/delete will be used if available. It
is occasionally useful to turn this option off when using
the editor on a terminal which can't keep up, or if the com-
munications lines may be scrambling the control characters.
Each successive "oh" merely toggles a switch within the
editor. An explanatory message is placed in the status
line.
For general information about the option command, type "ho".