07-25-2013
The logic goes like this. The code identifies the last END before line number 250000 and assigns the line number where this last END occurs to a marker variable M1.
Similarly marker variables M2 and M3 hold the line numbers where last END occurs before line number 500000 and 750000 respectively.
Now we have created 3 markers in the file for the split. Note that each marker line contains END.
The awk statement uses these 3 markers to split the file into 4.
Can you also try echoing the values for variables M1, M2 and M3 to know whether we have got the correct split.
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LEARN ABOUT OSX
uri::split
URI::Split(3) User Contributed Perl Documentation URI::Split(3)
NAME
URI::Split - Parse and compose URI strings
SYNOPSIS
use URI::Split qw(uri_split uri_join);
($scheme, $auth, $path, $query, $frag) = uri_split($uri);
$uri = uri_join($scheme, $auth, $path, $query, $frag);
DESCRIPTION
Provides functions to parse and compose URI strings. The following functions are provided:
($scheme, $auth, $path, $query, $frag) = uri_split($uri)
Breaks up a URI string into its component parts. An "undef" value is returned for those parts that are not present. The $path part is
always present (but can be the empty string) and is thus never returned as "undef".
No sensible value is returned if this function is called in a scalar context.
$uri = uri_join($scheme, $auth, $path, $query, $frag)
Puts together a URI string from its parts. Missing parts are signaled by passing "undef" for the corresponding argument.
Minimal escaping is applied to parts that contain reserved chars that would confuse a parser. For instance, any occurrence of '?' or
'#' in $path is always escaped, as it would otherwise be parsed back as a query or fragment.
SEE ALSO
URI, URI::Escape
COPYRIGHT
Copyright 2003, Gisle Aas
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.16.2 2012-02-11 URI::Split(3)