You can also specify the owner by his or her decimal identifier. The decimal identifier is the uid value in the /etc/passwd file. This option has the form:
An example is:
bru -x -o14720
The numeric user ID is used less often than the other two forms of the -o option, but is available for experienced UNIX users who want to use it. In some circumstances, it is possible for files to have user id numbers that do not match any user listed in the /etc/passwd file.