Identifying index files

We're building a PostGreSQL 7.3.4 system; we want to place database index
files on an external drive (for security and backup robustness); we have
seen in the documentation that is is possible to move the index files to a
new directory (after they are created) and making symbolic links to their
new location. Our problem is distinguishing the index files from data
files; does PostGreSQL have a naming convention for the index files? Or
is there any particular content we could grep for to identify these files?

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David Rickard
Software Engineer
The GTS Companies
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