.vs [space] ¶.vs +space ¶.vs -space ¶\n[.v] ¶Set the vertical spacing to, or alter it by, space. The default
scaling unit is ‘p’. If vs is called without an argument,
the vertical spacing is reset to the previous value before the last call
to vs.
GNU troff emits a warning in category ‘range’ if space
is negative; the vertical spacing is then set to the smallest possible
positive value, the vertical motion quantum (as found in the .V
register).
‘.vs 0’ isn’t saved in a diversion since it doesn’t result in a vertical motion. You must explicitly issue this request before interpolating the diversion.
The read-only register .v contains the vertical spacing; it is
associated with the environment (see Environments).
When a break occurs, GNU troff performs the following procedure.
\x escape sequence arguments
in the pending output line.
\x escape sequence arguments
in the line that has just been output.
Prefer vs or pvs over ls to produce double-spaced
documents. vs and pvs have finer granularity than
ls; moreover, some preprocessors assume single spacing.
See Manipulating Spacing, regarding the \x escape sequence and
the ls request.
.pvs [space] ¶.pvs +space ¶.pvs -space ¶\n[.pvs] ¶Set the post-vertical spacing to, or alter it by, space. The
default scaling unit is ‘p’. If pvs is called without an
argument, the post-vertical spacing is reset to the previous value
before the last call to pvs. GNU troff emits a warning in
category ‘range’ if space is negative; the post-vertical
spacing is then set to zero.
The read-only register .pvs contains the post-vertical spacing;
it is associated with the environment (see Environments).