-const char head_usage[] =
-"Usage: head [OPTION]... [FILE]...\n"
-"Print first 10 lines of each FILE to standard output.\n"
-"With more than one FILE, precede each with a header giving the file name.\n"
-"With no FILE, or when FILE is -, read standard input.\n\n"
-" -h display this help and exit\n";
-
-int
-head(int len, FILE *src)