How to modify text file?

[Karmashock]

I have another program that creates a text file which I automatically email with another program.

The problem is that this program always puts a carriage return at the end of any file it makes.

Basically want I want is some command that will subtract either the last symbol in the text file or remove "".

What I think I'm looking for is a negative append... if such a thing exists.

something like:
Echo somethingthatsubtracts >> text.txt

[carlitos.dll]

The author has been removed this message.

[Karmashock]

Thank you.

I'll figure out the rest.