`xx`; for example `%00` interpolates to `\0` (NUL),
`%09` to `\t` (TAB) and `%0a` to `\n` (LF).
-<pattern>::
+<pattern>...::
If one or more patterns are given, only refs are shown that
match againt at least one pattern, either using fnmatch(3) or
literally, in the latter case matching completely or from the