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How can I associate a UID to a specific username on IBM z/OS Unix System Services?

Within USS, I see content created in my user space which I do not own. File ownership lists a three digit numerical value, rather than a username, which I presume to be a UID. I've unsuccessfully attempted to make a username association using commands:

tsocmd "search class(USER) uid(###)"
tsocmd "rlist unixmap u### all"
share|improve this question
I've recently learned of the following command which can be used to lookup at UID given a valid userid: tsocmd "listuser ????? omvs". Unfortunately, my original question remains unresolved – jgrump2012 Jun 4 '13 at 20:05

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