To display a history of checkouts on UNIX, you use the cleartool lshistory command. Also, you must be in a VOB directory.
Here are some examples of the lshistory command formats you might find useful.
When including the -long option in the command, Rational® ClearCase® includes the name of the view.
With the -me option, Rational ClearCase lists only those elements on which you have worked.
The -cview option narrows the listing to elements in the current view.
The -user option lets you specify the username of a team member who has worked on elements in the current view.