in case of move there wont be an old file On Tue, May 12, 2009 at 4:24 PM, Aram Yegenian <[email protected]>wrote:
> > > Hi Yaman, > > Just out of the top of my head coz I just woke up... Why not use mv, coz mv > is atomic and any process that still has access to the file would still be > able to write to the old file until you restart that process. > > --- On Tue, 5/12/09, Yaman Saqqa <[email protected]> wrote: > > > From: Yaman Saqqa <[email protected]> > > Subject: [JoLUG-General] Question on cp > > To: [email protected] > > Date: Tuesday, May 12, 2009, 3:13 PM > > Hello Luggers, > > > > A quick question. > > > > Let's say I wanna rotate a log file upon reaching a > > certain size and the file name is time dependent. logrotate > > configuration wildcards will not help, so I'm writing a > > script to do it, my questions is, as per the pseudo below > > > > > > > > every x time > > check file size > > if size > y > > cp oldfile oldfile-1 && echo > oldfile # > > (copy-truncate) because processes have open fd's with > > oldfile > > fi > > > > If the file size is large, cp WILL take some time and > > CONCURRENTLY data is still being written to the oldfile. > > Will cp cater to every byte written to the oldfile up > > until the micro-second "&& echo kicks in"? > > Or will there be data loss? > > > > > > > > Thanks! > > > > -- > > abulyomon > > > > www.KiLLTHeUPLiNK.com > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- Husam Habannakeh +971 5055 164 89 Dubai +962 777 656 086 Amman +966 5611 54 798 Riyadh Sent from Riyadh, 01, Saudi Arabia --~--~---------~--~----~------------~-------~--~----~ ### Jordan Linux Users Group ### http://Jolug.org/ http://groups.google.com/group/Jolug ### Ubuntu Jordan LoCo Team ### https://wiki.ubuntu.com/JordanTeam http://lists.ubuntu.com/ubuntu-jo ### Ojuba Linux ### http://ojuba.org/ ### Jordan PHP ### http://groups.google.com/group/JoPHP -~----------~----~----~----~------~----~------~--~---
