magic words 

Situation 

File /home/users/suntong/local/bin/vm :

#!/bin/sh /usr/atria/bin/cleartool setview -exec '/clearlib/admin/tools/ViewMan.pl' DEFAULT_VIEW

change it to

#!/usr/atria/bin/cleartool setview -exec '/clearlib/admin/tools/ViewMan.pl' DEFAULT_VIEW

and it will not work any more.

Reason 

Because of aforementioned "30-character file name limit".

documented on: 2007.06.12