I realised the text actually means to say "terminal width - 1", not "terminal width: -1"
How about this instead? Index: bin/ps/ps.1 =================================================================== RCS file: /cvs/src/bin/ps/ps.1,v retrieving revision 1.109 diff -u -p -r1.109 ps.1 --- bin/ps/ps.1 23 Sep 2016 06:28:08 -0000 1.109 +++ bin/ps/ps.1 6 Oct 2016 19:35:12 -0000 @@ -543,7 +543,7 @@ If set to a positive integer, output is formatted to the given width in columns. Otherwise, .Nm -defaults to the terminal width \(mi 1, +defaults to the terminal width minus 1, or 79 columns if none of .Dv stdout , .Dv stderr -- Michal Mazurek
