list package version if installed (scriptable)

To: debian-user@lists.debian.org
Subject: list package version if installed (scriptable)
From: Jim Popovitch <jim@k4vqc.com>
Date: Thu, 07 Jan 2021 08:12:52 -0500
Message-id: <[🔎] 5e0312212fe9dc766fd8f30c3a4b45692d97457f.camel@k4vqc.com>

Hello!

What is a script'able way to list a pkg version (or nothing if it is not
installed)?

+1 for POSIX compatibility.

tia,

-Jim P.

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