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find -mtime off by one day?

 
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# 1  
Old 08-21-2005
find -mtime off by one day?
If I use the find command to find files older than n days I have to enter
find . -mtime +(n-1). I tried this on a Solaris 9 system and also Linux. Is this something that all Unix veterans know about (I'm new to Unix)? If so, maybe my man pages need to be updated (how to do this?). Smilie
# 2  
Old 08-22-2005
Yes, you have to specify one day less. This is something that you should find in the man pages.
# 3  
Old 08-22-2005
No, the man pages don't describe this. I based my code on the man pages and now I have to change to it use n-1 instead of n. Who controls the Unix man pages and how do I get updates?
# 4  
Old 08-23-2005
From the manual pages for GNU find...
Code:
      -atime n
             File was last accessed n*24 hours ago.  When find figures out how  many  24-hour  preiods
             ago  the file was last accessed, any fractional part is ignored, so to match -atime +1, a
             file has to have been modified at least two days ago.

      -mtime n
             File's  data was last modified n*24 hours ago.  See the comments for -atime to understand
             how rounding affects the interpretation of file modification times.

# 5  
Old 08-24-2005
Thanks, Ygor. The man pages on my Solaris and Linux systems don't have this text but they do behave as you described.
 
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