uuid_unparse - Man Page

convert a UUID from binary representation to a string


#include <uuid.h>

void uuid_unparse(uuid_t uu, char *out);
void uuid_unparse_upper(uuid_t uu, char *out);
void uuid_unparse_lower(uuid_t uu, char *out);


The uuid_unparse() function converts the supplied UUID uu from the binary representation into a 36-byte string (plus trailing '\0') of the form 1b4e28ba-2fa1-11d2-883f-0016d3cca427 and stores this value in the character string pointed to by out. The case of the hex digits returned by uuid_unparse() may be upper or lower case, and is dependent on the system-dependent local default.

If the case of the hex digits is important then the functions uuid_unparse_upper() and uuid_unparse_lower() may be used.

Conforming to

This library unparses UUIDs compatible with OSF DCE 1.1.


Theodore Y. Ts’o

See Also

uuid(3), uuid_clear(3), uuid_compare(3), uuid_copy(3), uuid_generate(3), uuid_time(3), uuid_is_null(3), uuid_parse(3)

Reporting Bugs

For bug reports, use the issue tracker at https://github.com/util-linux/util-linux/issues.


The libuuid library is part of the util-linux package since version 2.15.1. It can be downloaded from Linux Kernel Archive.

Referenced By

uuid(3), uuid_clear(3), uuid_compare(3), uuid_copy(3), uuid_generate(3), uuid_is_null(3), uuid_parse(3), uuid_time(3).

2022-05-11 util-linux 2.38.1 Programmer's Manual