the string "FreeBSD". Use the .Fx macro instead. Also did some
minor re-wording/formatting to work around a deficiency with
the .Fx macro when it comes to puncuation characters other than
periods and commas.
Correct usage: one of {-p pid, command} is required.
Open output file when command line is fully analyzed: incorrect `truss -o f'
command does not create an empty file anymore.