/usr/share/elvis/scripts/show.ex is in elvis-common 2.2.0-11.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | "This script defines a :show alias, which illustrates the way that
"substitution works in an alias.
alias show echo !!<=!< !!%=!% !!?=!? !!*=!* !!^=!^ !!2=!2 !!$=!$ arg=!arg=
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