Perforce File Locked By Departed User

"Locked" and "checked out" are two different things which require two different operations to undo. As Peter G. said, an admin can unlock a file with the unlock command:

p4 unlock -f

However, to revert a file checked out by another user, you need to impersonate that user by passing their client (workspace name), host (computer name) and user names to the revert command, like so:

p4 -c theirclient -H theirhost -u theiruser revert filename

So if a Perforce user named jdoe has file foo.txt checked out in workspace ws1 on a host named joesPC, an admin can revert it with the following command:

p4 -c ws1 -H joesPC -u jdoe revert foo.txt

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