from 'man rcs'<br><br><br>-u[rev]<br> Unlock the revision with number rev. If a branch is<br> given, unlock the latest revision on that branch. If<br> rev is omitted, remove the latest lock held by the<br> caller. Normally, only the locker of a revision can<br> unlock it. Somebody else unlocking a revision breaks<br> the lock. This causes a mail message to be sent to the<br> original locker. The message contains a commentary<br> solicited from the breaker. The commentary is ter-<br> minated by end-of-file or by a line containing . by<br> itself.<br>