'Command not found' error when installing Domino 6 on Red Hat Linux 9

I downloaded Domino Server 6 and am trying to install it on Red Hat Linux 9.0. But I am unable to proceed with the installation. I get the following errors when I run ./install:
: command not found
: command not found
: command not found
: command not found

  '/install: Line 7: syntax error 
near unexpected {
'/install: Line 7: 'CdPath() {
Why am I getting this error? Kindly help me.
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This was first published in December 2003