On 1/11/09 8:44 AM, John Summerfield wrote:
Probably. How do you know how many blocks to skip?
I don't -- I calculate approximate bytes not-sparse from end-of-file
using stat -- see below. Coincidentally, it happens to be the number of
bytes in all and only the blocks at the end of the file that contain
non-sparse data. Or, to put it another way, I don't calculate how many
blocks to skip from the beginning of the file, I calculate how many
blocks to read from the end of the file.
...
It is easy? I'm missing something.
Again, this is only for log files -- only appended to, for when they get
sparse because of logrotate copytruncate or "> filename" or similar
truncation, sparse-ness at the beginning of the file.
See my post Tue, 6 Jan 2009 14:30:24 -0800 for a full example, but
here's the main part:
tail -c $(( $(stat -c %b\*%B daemon.log) )) daemon.log ...
Pretty easy, eh? Again, again, this only works for log files, although I
should have said for sparse or not-sparse log files, and if sparse,
where sparse-ness is at the beginning.
- Larry
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