The `set` command can be used to sets _lots_ of options. No screen is
drawn, however, until a `plot` (Note:plot ), `splot` (Note:splot ), or
`replot` (Note:replot ) command is given.
The `show` command shows their settings; `show all` shows all the
settings.
If a variable contains time/date data, `show` will display it according to
the format currently defined by `set timefmt` (Note:timefmt ), even if that
was not in effect when the variable was initially defined.