使用 ESC + X 可以打开 minibuffer，可以不用按 M-x 啦。
Ref：
按一次 Esc 等于按住 Meta，这个是一直就有的啊。
在一些类型比较诡异的终端上，还有腾不出两只手的时候很有用。
确切的说不是 Esc-x，而是先按一次 Esc 然后再按 x。
https://www.gnu.org/software/emacs/manual/html_node/emacs/User-Input.html
You can also type Meta characters using two-character sequences
starting with <ESC>. Thus, you can enter `M-a' by typing `<ESC> a'.
You can enter `C-M-a' by typing `<ESC> C-a'. Unlike <META>, <ESC> is
entered as a separate character. You don't hold down <ESC> while
typing the next character; instead, press <ESC> and release it, then
enter the next character. This feature is useful on certain text
terminals where the <META> key does not function reliably.
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