diff --git a/Makefile b/Makefile
index 0f8712e..eb2b462 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,7 @@ SRC = \
 ifeq ($(OS),linux)
 SRC += \
 	insmod.c            \
+	lsmod.c             \
 	rmmod.c
 endif
 
diff --git a/lsmod.c b/lsmod.c
new file mode 100644
index 0000000..fd306bc
--- /dev/null
+++ b/lsmod.c
@@ -0,0 +1,60 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "util.h"
+
+static void parse_modline(char *buf, char **name, char **size,
+			  char **refcount, char **users);
+
+static void
+usage(void)
+{
+	eprintf("usage: %s\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	const char *modfile = "/proc/modules";
+	FILE *fp;
+	char buf[BUFSIZ];
+	char *name, *size, *refcount, *users;
+	size_t len;
+
+	ARGBEGIN {
+	default:
+		usage();
+	} ARGEND;
+
+	if (argc > 0)
+		usage();
+
+	printf("%-23s Size  Used by\n", "Module");
+
+	fp = fopen(modfile, "r");
+	if (!fp)
+		eprintf("fopen %s:", modfile);
+	while (fgets(buf, sizeof buf, fp)) {
+		parse_modline(buf, &name, &size, &refcount, &users);
+		if (!name || !size || !refcount || !users)
+			enprintf(1, "invalid format: %s\n", modfile);
+		len = strlen(users) - 1;
+		if (users[len] == ',' || users[len] == '-')
+			users[len] = '\0';
+		printf("%-20s%8s%3s %s\n", name, size, refcount,
+		       users);
+	}
+	fclose(fp);
+	return 0;
+}
+
+static void
+parse_modline(char *buf, char **name, char **size,
+	      char **refcount, char **users)
+{
+	*name = strtok(buf, " ");
+	*size = strtok(NULL, " ");
+	*refcount = strtok(NULL, " ");
+	*users = strtok(NULL, " ");
+}