I have a file, which I like to modify without creating any additional file.
I have somewhere in the file : A P B
and then elsewhere C X P.
A, B and C are fixed item where X and P are not.
I have Q , which is first few characters of P.
I like to convert second line C X P to C X Q.
Are you posting in the right place? Check out Where do I post X? to know for sure.
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Want more info? How to link
or How to display code and escape characters
are good places to start.