If
you do not want to check in your changes or you want to start with fresh copy,
you can cancel (undo) a checkout using the command line:
cleartooluncheckoutpath
On Windows systems only, you can also cancel (undo) a checkout
from Rational® ClearCase® Explorer
or Windows Explorer:
From Rational ClearCase Explorer
or Windows Explorer, right-click the file or directory.
On the Rational ClearCase shortcut
menu, click Undo Checkout. The Confirm undo checkout
window opens. Select or clear Save copy of the file with a '.keep'
extension.