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The entries for these logfiles are time stamped, the script originating the log is identified and the message is preceded with a question mark (?) 
for a warning and an exclamation mark (!) for a serious error. The question mark and exclamation mark are to facilitate looking for more imprtant events using grep.
Each night logcopy renames the .today file with .yesterday, the .yesterday with yesterday's date, and removes files older than 7 days. There are typically about 40 .today logfiles.