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# [FORMAT OPTIONS](#FORMAT_OPTIONS)

Choose the representation of the 1-wire unique identifiers. OWFS uses these identifiers as unique directory names.

Although several display formats are selectable, all must be in *family-id-crc8* form, unlike some other programs and the labelling on iButtons, which are *crc8-id-family* form.

## -f --format="f\[.]i\[\[.]c]"

Display format for the 1-wire devices. Each device has a 8byte address, consisting of:

[*f*](#f)

family code, 1 byte

[*i*](#i)

ID number, 6 bytes

[*c*](#c)

CRC checksum, 1 byte

Possible formats are *f.i* (default, 01.A1B2C3D4E5F6), *fi fic f.ic f.i.c* and *fi.c*

All formats are accepted as input, but the output will be in the specified format.

The address elements can be retrieved from a device entry in owfs by the *family, id and crc8* properties, and as a whole with *address.* The reversed id and address can be retrieved as *r\_id* and *r\_address.*

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Document: format(1so) from owfs 3.2.4-r9 (Chainguard OS)
Source: https://github.com/owfs/owfs