1 files changed, 3 insertions, 0 deletions
diff --git a/src/command.h b/src/command.h
index d1161c4..354f2ee 100644
--- a/src/command.h
+++ b/src/command.h
@@ -7,9 +7,12 @@
 #define ARGUMENTS int argc, char** argv
 #define NEXT_ARGS argc - 1, &argv[1]
 #define COMMAND(name) int name (ARGUMENTS) 
+#define COMMAND_EMPTY(name) int name (void)
 
 COMMAND(dd);
 COMMAND(cat);
 COMMAND(yes);
 COMMAND(echo);
 COMMAND(print);
+COMMAND_EMPTY(groups);
+COMMAND_EMPTY(user_id);