Thanks for Adriano.I have tried the way that mentioned by you,and found it's no use for me. should the '-F' option have no effect for symlinks maybe?
-----Original Message----- >From: Adriano Ferreira <[EMAIL PROTECTED]> >Sent: Jan 14, 2006 7:23 PM >To: Jeff Pang <[EMAIL PROTECTED]>, beginners@perl.org >Subject: Re: the 'tail' problem > >Jeff, > >Maybe all you have to do is make some adjustments to the pipe you're >opening. Besides the well known "-f" switch, some tail's (like gnu >tail) support "-F" which means a file is followed by its name and the >opening is retried from time to time. From "man tail" (GNU): > > -F same as --follow=name --retry > > With --follow (-f), tail defaults to following the file descriptor, > which means that even if a tail'ed file is renamed, tail will continue > to track its end. This default behavior is not desirable when you > really want to track the actual name of the file, not the file descrip- > tor (e.g., log rotation). Use --follow=name in that case. That causes > tail to track the named file by reopening it periodically to see if it > has been removed and recreated by some other program. > >If you found it works for symlinks, all you have to do is use > >> open (TAIL,"tail -F $log|") or die "can't open pipe:$!"; > >Regards, >Adriano Ferreira. > >On 1/14/06, Jeff Pang <[EMAIL PROTECTED]> wrote: >> I have a log file which is a symbol link to the real logfile,shown as >> following: > >> I have to access this file in perl script with unix 'tail -f' command.Part >> of the code is below: >> >> open (TAIL,"tail -f $log|") or die "can't open pipe:$!"; > >> This script is a daemon script which run permanently.There is no problem >> when in the same day.But when the date changed,the symbol link file will >> point to another real logfile automatically (which decided by other >> application program),such as: >> >[snip] >> >> How can I adjust this problem?Thanks a lot. -- http://home.earthlink.net/~pangj/ -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response>
