Index: head/usr.bin/showmount/showmount.8
===================================================================
--- head/usr.bin/showmount/showmount.8
+++ head/usr.bin/showmount/showmount.8
@@ -67,20 +67,20 @@
 .Pp
 The following options are available:
 .Bl -tag -width indent
-.It Fl a
+.It Fl a , Fl -all
 List all mount points in the form:
 .Bd -ragged -offset indent -compact
 .Ar host : Ns Ar dirpath .
 .Ed
-.It Fl d
+.It Fl d , Fl -directories
 List directory paths of mount points instead of hosts.
-.It Fl E
+.It Fl E , Fl -exports-script
 Show the
 .Ar host Ns 's
 exports list in a script-friendly format.
 Client addresses and the header are not shown, and special
 characters are escaped.
-.It Fl e
+.It Fl e , Fl -exports
 Show the
 .Ar host Ns 's
 exports list.
Index: head/usr.bin/showmount/showmount.c
===================================================================
--- head/usr.bin/showmount/showmount.c
+++ head/usr.bin/showmount/showmount.c
@@ -53,6 +53,7 @@
 #include <sys/socketvar.h>
 
 #include <err.h>
+#include <getopt.h>
 #include <netdb.h>
 #include <rpc/rpc.h>
 #include <rpc/pmap_clnt.h>
@@ -102,6 +103,14 @@
 int tcp_callrpc(const char *host, int prognum, int versnum, int procnum,
 		xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
 
+static const struct option long_opts[] = {
+	{ "all",			no_argument,	NULL,	'a' },
+	{ "directories",	no_argument,	NULL,	'd' },
+	{ "exports-script",	no_argument,	NULL,	'E' },
+	{ "exports",		no_argument,	NULL,	'e' },
+	{ NULL,				0,				NULL,	0 },
+};
+
 /*
  * This command queries the NFS mount daemon for it's mount list and/or
  * it's exports list and prints them out.
@@ -119,7 +128,7 @@
 	const char *host;
 	int ch, estat, nbytes;
 
-	while ((ch = getopt(argc, argv, "adEe13")) != -1)
+	while ((ch = getopt_long(argc, argv, "+adEe13", long_opts, NULL)) != -1)
 		switch (ch) {
 		case 'a':
 			if (type == 0) {