Re: read the last line in a file?

Tom Worster wrote: > imagine writing a script to run as a daemon reading data off the > bottom of a log file that gets updated every few minutes and > processing each new log line as they arrive. > > i could exec("tail $logfile", $lines, $status) every now and then. or > poll the file mtime and run exec("tail $logfile", $lines, $status) > when it changes. there will be some lag due to the polling interval. > > but it would be nice to not have to poll the file and somehow trigger > the processing of the new line when the log file is written. but i'm > not sure how to do that. > > any ideas? 1) the inotify interface will alert you when a file or directory changes. 2) run tail -f logfile | <yourscript> and read from stdin. (not tested).. 3) if you can change the logfile to a fifo, you're all set. /Per -- Per Jessen, Zürich (11.7°C)