clear lines of LOG file

[guif]

Hi!

I would like to make a question.
I have a big log that it's increment continuous time.

I would like that the script contents only 1 million of lines. (About 250mb)
When I execute: cat jxl.log | wc -l i see the exactly lines, but the question is: How can i make a maintenance to clear the lines increase 1 more line?

[Themer]

i see the exactly lines, but the question is: How can i make a maintenance to clear the lines increase 1 more line?

I would like to try and help, but I am afraid that this makes absolutely no sense whatsoever. Could you try to re-word the question, or explain a little better what exactly you are trying to do with the log file?

[guif]

ok. I explain another time.

I have one log. This log increase continuous and i would like to control the size of this.
I only like to have this log with 250Mb (about 1 million lines)


How it's possible to control this??

[Themer]

Well, there may be several ways, but one could be to have a cron job that checks it's size, and then if it's greater than 250 Mb, remove the first few lines (so you always have the most recent 1 million), then check again - if it's stil to big, remove a few more lines, and so on until it's done. This loop should only take a fraction of a second to run, and should only need to execute every hour at most.