The following patch documents the exit codes of biff(1). Best wishes, Ryan
Index: usr.bin/biff/biff.1 =================================================================== RCS file: /cvs/src/usr.bin/biff/biff.1,v retrieving revision 1.15 diff -u -r1.15 biff.1 --- usr.bin/biff/biff.1 31 May 2007 19:20:08 -0000 1.15 +++ usr.bin/biff/biff.1 5 Apr 2013 20:51:55 -0000 @@ -72,6 +72,18 @@ .Ev mail variable of .Xr csh 1 . +.Sh EXIT STATUS +The +.Nm +utility exits with status: +.Bl -tag -width Ds +.It 0 +Mail notification was enabled at invocation time. +.It 1 +Mail notification was disabled at invocation time. +.It >1 +An error occurred. +.El .Sh SEE ALSO .Xr csh 1 , .Xr mail 1 ,
