To really answer you, I need a definition of what you intend for corresponding uptime message. Anyway, I think you want to know "how to preserve (across different script runs) the records that might need to be reprocessed after an uptime message gets logged"... well, I would use a hash tied to a file (see tie or Tie::Hash).
Whenever you find an incomplete record you create a new key in the hash with the relevant data for value; when you get the uptime you write out the saved data with the uptime timestamp and you undefine the key from the hash.

In reply to Re: comma delimited, syslog parsing by ant9000
in thread comma delimited, syslog parsing by jeff061

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