In sam, g has two uses - either as a guard or after an s command where all substitutions are made

Quoting sam(1) (available at <http://9p.io/magic/man2html/1/sam>)
after an s command:
> If the command is followed by a g, as in
>                s/x/y/g, all matches in the range are substituted.
as a guard:
> g/regexp/ command
> v/regexp/ command
>                If the range contains (g) or does not contain (v) a
>                match for the expression, set dot to the range and run
>                the command.

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