source: vendor/perl/5.8.8/pod/splitman

#!/usr/bin/perl

while (<>) {
    if ($seqno = 1 .. /^\.TH/) {
        unless ($seqno =~ /e/i) {
            $header .= $_;
        } 
        next;
    } 

    if ( /^\.Ip\s*"(.*)"\s*\d+$/) {
        $desking = 0;
        $desc = $1;
        if (name($desc) ne $myname) {
            $myname = name($desc);
            print $myname, "\n";
            open(MAN, "> $myname.3pl");
            print MAN <<EOALL;
$header
.TH $myname 3PL "\\*(RP"
.SH NAME 
$myname
.SH SYNOPSIS 
.B $desc
EOALL
        } else {
            print MAN <<EOMORE;
.br
.ti +3n
or
.br
.B $desc
EOMORE
        } 
        next;
    } 
    unless ($desking) {
        print MAN ".SH DESCRIPTION\n";
        $desking = 1;
    } 
    print MAN;
} 

sub name {
    ($_[0] =~ /(\w+)/)[0];
}