NAMEsplit-logfile - Split combined virtual hosts access log into one file per virtual host
split-logfile < logfile
This script will take a combined Web server access log file and break its contents into separate files.
It assumes that the first field of each line is the virtual host identity (put there by "%v"), and that the logfiles should be named that+".log" in the current directory.
The combined log file is read from stdin. Records read will be appended to any existing log files.