本文介绍了一个实用的Emacs插件smex，该插件能够显示最近执行过的命令，并提供了多种快捷键帮助用户快速查找和执行这些命令。其中包括切换到下一个/上一个匹配项、执行选中的命令、查看当前选中命令的帮助信息、跳转到命令定义处、显示未绑定快捷键的常用命令等功能。
function: show most recently executed commands
useful key strokes:
C-s/C-r switches to the next/previous match.
Enter executes the selected command.
C-h f runs describe-function on the currently selected command.
M-.jumps to the definition of the selected command.
C-h w shows the key bindings for the selected command.
smex-show-unbound-commands shows frequently used commands that have no key bindings.
smex-major-mode-commands limited to commands that are relevant to the active major mode.
https://github.com/nonsequitur/smex
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