How do you add or remove text to the end of many lines at once in Emacs?

Question

e.g. I want to add a double quote to the end of a bunch of highlighted lines. Or I want to delete two characters from a bunch of highlighted lines. Is there a command for this? I know there is "M-x r t" for inserting a rectangle of text, but this only works if everything is lined up vertically, which isn't generally the case of the ends of lines.

Answer 1

You can

1. save a keyboard macro with C-x(C-e"C-fC-x), resp. C-x(C-eBackspaceBackspaceC-fC-x). Then invoke the macro with C-xe, e, e, e...
2. do a regex replacement with M-C-%. Replace $ with " to add a double quote, replace ..$ with nothing to delete last two characters.