R""(
Show the changes between each version of your default profile:
This command shows what packages were added, removed or upgraded between subsequent versions of a profile. It only shows top-level packages, not dependencies; for that, use nix profile
diff-closures".
The addition of a package to a profile is denoted by the string <tt>∅ -\></tt>
<em>version</em>, whereas the removal is denoted by <em>version</em> <tt>-\> ∅</tt>.
)""