.I yyyy/mmdd
(year, month, day)
in the style of the dump file system
-(see Plan 9's \fIfs\fR(4)).
+(see \fIfs\fR(4)).
If
.I vacfile
already exists, an additional backup day is added to the
.I pattern
or
.B exclude
-.I pattern .
+.IR pattern .
When considering whether to include a directory or file
in the vac archive,
the earliest matching pattern in the file