There are two vim Ex modes:the vi compatible Ex-mode (vim -e -s),vim improved Ex mode (vim -E -s).Vim improved Ex mode allows for more advanced commands than the vi compatible Ex-mode, however what are the main differences? Or where I can find them?
What is the difference between Ex mode and improved Ex mode?
ex mode
This is actually documented in a somewhat 'hidden' non-obvious way, from :help Ex-modeQ                       Switch to Ex mode.  This is a bit like typing :                        commands one after another, except:                        - You don't have to keep pressing :.                        - The screen doesn't get updated after each command.                        - There is no normal command-line editing.                        - Mappings and abbreviations are not used.                        In fact, you are editing the lines with the standard                        line-input editing commands (<Del> or <BS> to erase,                        CTRL-U to kill the whole line).                        Vim will enter this mode by default if it's invoked as                        ex on the command-line.                        Use the :vi command :visual to exit Ex mode.                        Note: In older versions of Vim Q formatted text,                        that is now done with gq.  But if you use the                        vimrc_example.vim script Q works like gq.                                        gQgQ                      Switch to Ex mode like with Q, but really behave                        like typing : commands after another.  All command                        line editing, completion etc. is available.                        Use the :vi command :visual to exit Ex mode.                        {not in Vi}The first paragraph (Q) documents ex mode (-e), and the second one documents the improved ex mode (-E).With ex mode (-e), Vim tries to emulate Ex as much as possible, and a number of Vim improvements won't work (such as mappings, user-defined functions, line editing).With improved ex mode (-E), Vim really behaves like typing : commands after another.