-bash: /mnt/cdrom/runInstaller: /bin/sh: bad interpreter: Permission
denied

solution for this error while installing Oracle10g on Linux is at

http://staff.in2.hr/denis/oracle/10g...edora1_en.html

including the jist here in case the web page moves/changes later on:
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Note: if you get thew following error when running the installer from
CD-ROM
bash: /mnt/cdrom/runInstaller: /bin/sh: bad interpreter: Permission
denied
you should check how your CD-ROM was mounted. It should be mounted by
user root, and the information about the filesystem in /etc/fstab
sohuld look similar to this:

/dev/cdrom /mnt/cdrom auto exec,noauto,owner,kudzu,ro 0 0

Now the installer should be up and running.
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FYI
--Parag