-.B "\-l, \-\-list"
-Prints a space-separated list of available hashing algorithms to
-standard output and exits successfully.
+.BI "\-E, \-\-encoding=" encoding
+Use the given
+.I encoding
+to represent hashes in the output. This is not interoperable with other
+programs, but it's handy, e.g., for building sha1 URNs. The encodings
+recognized are
+.B hex
+(the default),
+.B base64
+and
+.BR base32 .
+Type
+.B hashsum \-\-list enc
+for a list of supported encodings.