<sys/stat.h>, <sys/types.h>, <unistd.h>, (STDOUT_FILENO): Remove; no longer needed. "quotearg.h": Add include. (file_name): Do not bother to explicitly initialize to NULL; it's less efficient on some hosts. (close_stdout_status): Remove test as to whether stdout was already closed; it breaks for the case "echo x | sort >&-". Quote file name colons. Do not assume that _("write error") lacks format strings.