Writing modified files program

Hi!
I want to do a program that does a certain job, but I don’t have enough experience
Can anyone show me or write to me its source code
As the program is:
A place where A file is placed A folder of text or program files
I enter an command to delete specific lines - for example, lines that do not end with a symbol (.) -
The program processes the file (s) and executes the command if any of these lines exist
Finally creates the modified files or prepares the original files

I will be very grateful for this help from you :blush:
and Sorry for my language, this is translated

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