which program/command can show wireless connection quality?

To: Debian-user List Debian <debian-user@lists.debian.org>
Subject: which program/command can show wireless connection quality?
From: Long Wind <longwind2@yahoo.com>
Date: Thu, 9 Aug 2018 00:29:31 +0000 (UTC)
Message-id: <[🔎] 979181799.4451576.1533774571547@mail.yahoo.com>
References: <979181799.4451576.1533774571547.ref@mail.yahoo.com>

i have a USB wireless card, it doesn't seem stable, sometimes it's slow

i even suspect changing USB connector can affect network speed

which program can show connection quality?
i use twm, those that depend on big software (KDE/GNOME) are not preferred

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