how do I chop of characters at the end of a line...

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Autor: Kevin Brown
Data:  
Assunto: how do I chop of characters at the end of a line...
> I want to take a variable say a="string.txt" and chop off the last 4
> characters so I can make variable b equal to just "string"


What programming language?

You can use cut in a shell script, or treat it as an array and shorten the array
length by 4 spots, etc...