PDF "validator"?

[Thomas Dowling]

Web4Lib--

I'm tending a collection of electronic theses and dissertations in PDF 
format, in which students (or their grad schools) are supposed to upload 
the PDF and then check that the uploaded version opens correctly when 
downloaded again.  Too often, no one checks the PDF and we get a copy 
that was corrupted during the upload.

Does anyone know of a tool that can check PDFs for common errors, and 
that I can script in a Unix command-line environment?

-- 
Thomas Dowling
OhioLINK - Ohio Library and Information Network
tdowling at ohiolink.edu