Rebuilding SIS attachment links from log

[Daniel Miller]

This seems simple enough...I'm just not script wizard.  If someone can 
throw together a starting point I can test and tweak it from there.  It 
seems to me:

1.  Read /var/mail/mail.err or specified logfile
2.  For each "failed: 
read(/var/mail/attachments/aa/bb/attachmentHash-userHash" line,
     a. Confirm /var/mail/attachments/aa/bb/hashes/attachmentHash exists
         i. If attachmentHash is missing display such for possible 
backup searching.
     b. create link attachmentHash-userHash to hashes/attachmentHash
3.  Continue to end of file

Can this be done via "pure" BASH?  Need sed/awk as well?

-- 
Daniel