Is bin ever written to?

[Knapp]

I was wondering if anything in a set up system ever needs to write to
/bin or /sbin or /usr/bin or /usr/sbin?
I was thinking of putting them in a ram disk with SquashFS to speed up
the system but it can only read and not write.
As far as I know the only time writing is needed is with a system update.

-- 
Douglas E Knapp

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