Adding the new C files too.

printenv.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+extern char **environ;
+
+int
+main(int argc, char **argv)
+{
+	char *var;
+
+	if(argc == 1) {
+		while(*environ)
+			printf("%s\n", *environ++);
+
+		return 0;
+	}
+	while(*++argv) {
+		if((var = getenv(*argv)))
+			printf("%s\n", var);
+	}
+
+	return 0;
+}
+