Dear Monks,
I have a textfile looking like this:

Dit is een voorbeeldtekst
The quick brown fox jumps over the lazy dog.
SOURCEREPOSITORYNAME
Roses are red, violets are blue
And Osama Is coming To Kill you
[download]

I want to change it in this:

Dit is een voorbeeldtekst
The quick brown fox jumps over the lazy dog.
SOURCEREPOSITORYNAME=Development
Roses are red, violets are blue
And Osama Is coming To Kill you
[download]

To achieve this epic feat, I wrote the following piece of code (roughly based on my camel):

#!perl -w

use strict;
my $line;
my $CTLfile = 'y:\perl\test.ctl';
local $^I = '.bak';
open (CTLHANDLE, "+<$CTLfile");
while($line=<CTLHANDLE>){
    $line =~ s/SOURCEREPOSITORYNAME/SOURCEREPOSITORYNAME=Development/g
+;
    print CTLHANDLE "$line";
}
close(CTLHANDLE);
undef $^I;
[download]

This renders the following output:

Dit is een voorbeeldtekst
The quick brown fox jumps over the lazy dog.
SOURCEREPOSITORYNAME
Roses are red, violets are blue
And Osama Is coming To Kill youDit is een voorbeeldtekst
Dit is een voorbeeldtekst
ver the lazy dog.
ver the lazy dog.
E
E
es are red, violets are blue
es are red, violets are blue
uu
[download]

I cannot explain this. I know there are modules helping for in place editing, but I don't want to use them. can someone explain the output, why it looks like this and what I can do to achieve my goal?

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