add directory study

study/linux-travel/MINIX-1.5/1.5/Source/commands/getlf.c

@@ -0,0 +1,25 @@
+/* getlf - get a line feed		Author: Andy Tanenbaum */
+
+#include <sys/types.h>
+#include <fcntl.h>
+
+main(argc, argv)
+int argc;
+char *argv[];
+{
+  char c;
+
+  /* Echo argument, if present. */
+  if (argc == 2) {
+	std_err(argv[1]);
+	std_err("\n");
+  }
+  close(0);
+  open("/dev/tty", O_RDONLY);
+
+  do {
+	if (read(0, &c, 1) <= 0) exit(1);
+	if (c <= 0) exit(1);
+  } while (c != '\n');
+  exit(0);
+}