How to switch user given a UID?

Vishrant asked:

I only know the UID of a user, is it possible to switch user using UID in CentOS like we do using username like su -u someuser?

My answer:

Look up the username with the id command, e.g.:

id -un 1003

Then put it together with command substitution:

su - $(id -un 1003)

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