I don't know how active or maintained it is, but there appear to be some modules to interface with ClearCase on this site

I know it's not a direct answer to your question, but I may allow you to avoid having to shell out to cleartool directly.

In reply to Re: Unable to get a tcshell command line working in PERL v5 system command by Crackers2
in thread Unable to get a tcshell command line working in PERL v5 system command by SteveC

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