Online text linux editor

Input text, use a wysiwyg editor, create required linux filtering. So basically I want to paste text into a window. I want to delete, add words/ expressions and I would like a linux command string that will give me the output I edited. Awk, sed, or any other debian package can be used in the output. Basically, I would like to paste text in a window -- make edits -- then get a command string. I would take this string and run it against the original input file and get the desired output in a linux terminal.