bug#6202: Async shell command, switching mode, and sleep-for

[Štěpán Němec]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> I strongly recommend to stay away from shell-command and friends in Lisp
> code (they're mostly used and meant for interactive use), and use
> start-process instead.

Wouldn't it make sense to have such a strong recommendation mentioned
somewhere user-visible, such as in the relevant commands' docstrings?

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