Adding ARGBEGIN for basename.

basename.1

@@ -3,6 +3,10 @@
 basename \- strip leading path component
 .SH SYNOPSIS
 .B basename
+.RB [ \-a ]
+.RB [ \-z ]
+.RB [ \-s
+.IR suffix ]
 .I string
 .RI [ suffix ]
 .SH DESCRIPTION
@@ -12,6 +16,17 @@ prints the
 with any leading path components, and the
 .IR suffix ,
 removed.
+.SH OPTIONS
+.TP
+.BI \-a
+multiple arguments will each be treated as strings
+.TP
+.BI \-s " suffix"
+specifies the suffix that should be removed
+.TP
+.BI \-z
+output will be separated with NUL
+.TP
 .SH SEE ALSO
 .IR dirname (1),
 .IR basename (3)