What should I put inside the file called wlan0?

To: debian-user mailing list <debian-user@lists.debian.org>
Subject: What should I put inside the file called wlan0?
From: Stella Ashburne <rewefie@gmx.com>
Date: Mon, 28 Feb 2022 19:49:32 +0100
Message-id: <[🔎] trinity-165fca86-86bc-46b7-85be-b03c841f4450-1646074172150@3c-app-mailcom-bs04>

I quote from Debian Wiki (https://wiki.debian.org/WiFi/HowToUse) :

"Restrict the permissions of /etc/network/interfaces, to prevent pre-shared key (PSK) disclosure (alternatively use a separate config file such as /etc/network/interfaces.d/wlan0 on newer Debian versions): "

What should I put in the file called wlan0? Said wiki does not provide examples.

Best regards.

Stella

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