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.TH "LOGRESOLVE" 1 "2018-09-27" "Apache HTTP Server" "logresolve"
.SH NAME
logresolve \- Resolve IP-addresses to hostnames in Apache log files
.SH "SYNOPSIS"
.PP
\fB\fBlogresolve\fR [ -\fBs\fR \fIfilename\fR ] [ -\fBc\fR ] < \fIaccess_log\fR > \fIaccess_log\&.new\fR\fR
.SH "SUMMARY"
.PP
\fBlogresolve\fR is a post-processing program to resolve IP-addresses in Apache's access logfiles\&. To minimize impact on your nameserver, logresolve has its very own internal hash-table cache\&. This means that each IP number will only be looked up the first time it is found in the log file\&.
.PP
Takes an Apache log file on standard input\&. The IP addresses must be the first thing on each line and must be separated from the remainder of the line by a space\&.
.SH "OPTIONS"
.TP
\fB-s \fIfilename\fR\fR
Specifies a filename to record statistics\&.
.TP
\fB-c\fR
This causes \fBlogresolve\fR to apply some DNS checks: after finding the hostname from the IP address, it looks up the IP addresses for the hostname and checks that one of these matches the original address\&.
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