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<p>
For any given task that enough people have wanted to do before on a computer, there is a multitude of tools available to perform that task on Linux.
Here is a small list of cherry-picked ones that I tend to forget (or that I want to promote :) ).
As I use Arch Linux, some may be Arch-specific.
</p>
<ul>
<li><p>
<b>pulseaudio-equalizer-ladspa</b>. [<a href="https://www.archlinux.org/packages/community/any/pulseaudio-equalizer-ladspa/" target="_blank">Arch repos</a>]
Assuming you use PulseAudio, if you want to run a very simple equalizer over whatever comes out of your speakers, use this package.
The GUI executable is called <code>pulseaudio-equalizer-gtk</code>.
</p></li>
<li><p>
<b>nload</b>. [<a href="https://www.archlinux.org/packages/community/x86_64/nload/" target="_blank">Arch repos</a>]
For nice graphs/statistics on current network usage (mbits incoming/outgoing).
To show all interfaces, invoke it as <code>nload -m</code>; to show only a single interface, use e.g. <code>nload enp3s0f1</code>.
</p></li>
<li><p>
<b>paccache</b>. [<a href="https://www.archlinux.org/packages/community/x86_64/pacman-contrib/" target="_blank">in pacman-contrib</a>]
To flexibly purge package files from the Pacman cache.
Pacman proper has <code>--clean</code>, but paccache allows you to remove e.g. all but the most recent three versions of all packages, ignoring stuff related to nvidia:
<blockquote>
paccache -r -k 3 -i nvidia,nvidia-settings,nvidia-utils,opencl-nvidia,linux,linux-firmware,linux-headers,cuda
</blockquote>
Also check out the other scripts in pacman-contrib, like pacdiff and rankmirrors.
</p></li>
<li><p>
<b>pdfpc</b>. [<a href="https://www.archlinux.org/packages/community/x86_64/pdfpc/" target="_blank">Arch repos</a>]
Lightweight PDF presenting, with even some really esoteric features like detecting animated slides in a LaTeX beamer presentation (that doesn't really work in my experience).
Multi-monitor support.
</p></li>
</ul>
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