On 01/26/2011 04:22 PM, MRAB wrote:
On 26/01/2011 10:59, Xavier Heruacles wrote:
I have do some log processing which is usually huge. The length of each
line is variable. How can I get the last line?? Don't tell me to use
readlines or something like linecache...
Seek to somewhere near the end and then read use readlines(). If you
get fewer than 2 lines then you can't be sure that you have the entire
last line, so seek a little farther from the end and try again.
I think this has got to be the most efficient solution.
You might get the source code for the open source UNIX utility "tail"
and see how they do it. It seems to work with equal speed no matter how
large the file is and I suspect it uses MRAB's solution, but because
it's written in C, it probably examines each character directly rather
than calling a library routine like readlines.
Alan
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