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Latex Endeavors
Some unintuitive quirks of Latex
Never
9.1.2026
────────────────────
BIBLATEX AND BIBER
Biber doesn’t run
Biber doens’t run if the (fedora) package  libxcrypt-compat  is missing.
It will fail with the error message
biber: error while loading shared libraries: libcrypt.so.1: cannot open shared object file: No such file or directory
]8;;\

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<header id="page-header">
<ul><li><a href="index.html">Home</a></li></ul>
</header>
<header id="title-block-header">
<h1 class="title">Latex Endeavors</h1>
<p class="subtitle">Some unintuitive quirks of Latex</p>
<p class="author">Never</p>
<p class="date">9.1.2026</p>
</header>
<section id="content">
<nav id="TOC" role="doc-toc">
<ul>
<li><a href="#biblatex-and-biber" id="toc-biblatex-and-biber">BibLaTeX
and Biber</a>
<ul>
<li><a href="#biber-doesnt-run" id="toc-biber-doesnt-run">Biber doesn’t
run</a></li>
</ul></li>
</ul>
</nav>
<article>
<h1 id="biblatex-and-biber">BibLaTeX and Biber</h1>
<h2 id="biber-doesnt-run">Biber doesn’t run</h2>
<p>Biber doens’t run if the (fedora) package
<code>libxcrypt-compat</code> is missing. It will fail with the error
message</p>
<pre><code>biber: error while loading shared libraries: libcrypt.so.1: cannot open shared object file: No such file or directory</code></pre>
</article>
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Random linux utilities
Neat things I picked up along the way
Never
25.7.2025
────────────────────
MERGE PDFS
Using Ghostscript
Ghostscript has a feature to merge multiple pdf files into one. Although
ImageMagick also has this feature, I prefer this one, as it doesn’t
rasterize and scales down the pdf files.
gs -dNOPAUSE -sDEVICE=pdfwrite \
 -sOUTPUTFILE=output.pdf \
 -dBATCH 1.pdf 2.pdf
]8;;\

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</header>
<header id="title-block-header">
<h1 class="title">Random linux utilities</h1>
<p class="subtitle">Neat things I picked up along the way</p>
<p class="author">Never</p>
<p class="date">25.7.2025</p>
</header>
<section id="content">
<nav id="TOC" role="doc-toc">
<ul>
<li><a href="#merge-pdfs" id="toc-merge-pdfs">Merge pdfs</a>
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Ghostscript</a></li>
</ul></li>
</ul>
</nav>
<article>
<h1 id="merge-pdfs">Merge pdfs</h1>
<h2 id="using-ghostscript">Using Ghostscript</h2>
<p>Ghostscript has a feature to merge multiple pdf files into one.
Although ImageMagick also has this feature, I prefer this one, as it
doesn’t rasterize and scales down the pdf files.</p>
<div class="sourceCode" id="cb1"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">gs</span> <span class="at">-dNOPAUSE</span> <span class="at">-sDEVICE</span><span class="op">=</span>pdfwrite <span class="dt">\</span></span>
<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a> <span class="at">-sOUTPUTFILE</span><span class="op">=</span>output.pdf <span class="dt">\</span></span>
<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a> <span class="at">-dBATCH</span> 1.pdf 2.pdf</span></code></pre></div>
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Using rsync on Android to syncronise my Music library
Never
12.01.2026
────────────────────
SETUP TERMUX
Install Termux using F-Droid.
Update software repos.
pkg update
Grant file access permissions using.
termux-setup-storage
ESTABLISHING AN SSH CONNECTION
If network (such as eduroam) is blocking ssh trafic between machines,
open a Wi-Fi Hotspot on your Linux machine and connect the Android
device to it before using  rsync  or  ssh .
Configuring Android
Install the openssh server on Termux.
pkg install openssh
Start the ssh server daemon.
sshd
Get the ip address of the Android machine (in the Hotspot).
ifconfig
Warning: cannot open /proc/net/dev (Permission denied). Limited output.
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
 inet 127.0.0.1 netmask 255.0.0.0
 unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC)
rmnet0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1280
 inet 10.200.157.166 netmask 255.255.255.0 destination 10.200.157.166
 unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC)
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
 inet 10.42.0.200 netmask 255.255.255.0 broadcast 10.42.0.210
 unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC)
In this case 10.42.0.200.
The ssh server should now be running and listening on port 8022. You can
check by running
nmap -Pn <ip_address>
For me  <ip_address>  whould be 10.42.0.200.
Get the username.
whoami
u0_a700
Set a password for this user.
passwd
Connecting to Android via ssh
Make sure you have an ssh key pair on the Linux system. If not generate
one using  ssh-keygen .
Now connect to Android by  ssh .
ssh <username>@<ip_address> -p 8022
SYNCRONISING FILES WITH RSYNC
Install  rsync  on Termux and Linux. Make sure to keep your own openssl
config.
pkg install rsync
Now on your Linux machine, syncronise your Music library with rsync.
rsync -av -e "ssh -p 8022" ~/Music <username>@<ip_address>:/data/data/com.termux/files/home/storage/music
Refreshing the Android MediaStore
Android uses a Database to store files. In order to play your music,
this database needs to be refreshed. This can be achieved by a reboot or
by using adb to manually refresh it.
sudo dnf install adb
Connect the Android device via USB and see if it is listed.
adb devices
If it is, restart adb in TCP mode with port 5555
adb tcpip 5555
Connect to the device using its .
adb connect <ip_address>
Refresh MediaStore.
adb shell am broadcast -a android.intent.action.MEDIA_SCANNER_SCAN -d file:///data/data/com.termux/files/home/storage/music/
]8;;\

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<h1 class="title">Using rsync on Android to syncronise my Music
library</h1>
<p class="author">Never</p>
<p class="date">12.01.2026</p>
</header>
<section id="content">
<nav id="TOC" role="doc-toc">
<ul>
<li><a href="#setup-termux" id="toc-setup-termux">Setup Termux</a></li>
<li><a href="#establishing-an-ssh-connection"
id="toc-establishing-an-ssh-connection">Establishing an ssh
connection</a>
<ul>
<li><a href="#configuring-android"
id="toc-configuring-android">Configuring Android</a></li>
<li><a href="#connecting-to-android-via-ssh"
id="toc-connecting-to-android-via-ssh">Connecting to Android via
ssh</a></li>
</ul></li>
<li><a href="#syncronising-files-with-rsync"
id="toc-syncronising-files-with-rsync">Syncronising files with rsync</a>
<ul>
<li><a href="#refreshing-the-android-mediastore"
id="toc-refreshing-the-android-mediastore">Refreshing the Android
MediaStore</a></li>
</ul></li>
</ul>
</nav>
<article>
<h1 id="setup-termux">Setup Termux</h1>
<p>Install Termux using F-Droid.</p>
<p>Update software repos.</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="ex">pkg</span> update</span></code></pre></div>
<p>Grant file access permissions using.</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">termux-setup-storage</span></span></code></pre></div>
<h1 id="establishing-an-ssh-connection">Establishing an ssh
connection</h1>
<p>If network (such as eduroam) is blocking ssh trafic between machines,
open a Wi-Fi Hotspot on your Linux machine and connect the Android
device to it before using <code>rsync</code> or <code>ssh</code>.</p>
<h2 id="configuring-android">Configuring Android</h2>
<p>Install the openssh server on Termux.</p>
<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="ex">pkg</span> install openssh</span></code></pre></div>
<p>Start the ssh server daemon.</p>
<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="ex">sshd</span></span></code></pre></div>
<p>Get the ip address of the Android machine (in the Hotspot).</p>
<div class="sourceCode" id="cb5"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="ex">ifconfig</span></span></code></pre></div>
<pre><code>Warning: cannot open /proc/net/dev (Permission denied). Limited output.
lo: flags=73&lt;UP,LOOPBACK,RUNNING&gt; mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC)
rmnet0: flags=4305&lt;UP,POINTOPOINT,RUNNING,NOARP,MULTICAST&gt; mtu 1280
inet 10.200.157.166 netmask 255.255.255.0 destination 10.200.157.166
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC)
wlan0: flags=4163&lt;UP,BROADCAST,RUNNING,MULTICAST&gt; mtu 1500
inet 10.42.0.200 netmask 255.255.255.0 broadcast 10.42.0.210
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC)</code></pre>
<p>In this case 10.42.0.200.</p>
<p>The ssh server should now be running and listening on port 8022. You
can check by running</p>
<div class="sourceCode" id="cb7"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="fu">nmap</span> <span class="at">-Pn</span> <span class="op">&lt;</span>ip_address<span class="op">&gt;</span></span></code></pre></div>
<p>For me <code>&lt;ip_address&gt;</code> whould be 10.42.0.200.</p>
<p>Get the username.</p>
<div class="sourceCode" id="cb8"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="fu">whoami</span></span></code></pre></div>
<pre><code>u0_a700</code></pre>
<p>Set a password for this user.</p>
<div class="sourceCode" id="cb10"><pre
class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="fu">passwd</span></span></code></pre></div>
<h2 id="connecting-to-android-via-ssh">Connecting to Android via
ssh</h2>
<p>Make sure you have an ssh key pair on the Linux system. If not
generate one using <code>ssh-keygen</code>.</p>
<p>Now connect to Android by <code>ssh</code>.</p>
<div class="sourceCode" id="cb11"><pre
class="sourceCode sh"><code class="sourceCode bash"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="fu">ssh</span> <span class="op">&lt;</span>username<span class="op">&gt;</span>@<span class="op">&lt;</span>ip_address<span class="op">&gt;</span> -p 8022</span></code></pre></div>
<h1 id="syncronising-files-with-rsync">Syncronising files with
rsync</h1>
<p>Install <code>rsync</code> on Termux and Linux. Make sure to keep
your own openssl config.</p>
<div class="sourceCode" id="cb12"><pre
class="sourceCode sh"><code class="sourceCode bash"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a><span class="ex">pkg</span> install rsync</span></code></pre></div>
<p>Now on your Linux machine, syncronise your Music library with
rsync.</p>
<div class="sourceCode" id="cb13"><pre
class="sourceCode sh"><code class="sourceCode bash"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a><span class="fu">rsync</span> <span class="at">-av</span> <span class="at">-e</span> <span class="st">&quot;ssh -p 8022&quot;</span> ~/Music <span class="op">&lt;</span>username<span class="op">&gt;</span>@<span class="op">&lt;</span>ip_address<span class="op">&gt;</span>:/data/data/com.termux/files/home/storage/music</span></code></pre></div>
<h2 id="refreshing-the-android-mediastore">Refreshing the Android
MediaStore</h2>
<p>Android uses a Database to store files. In order to play your music,
this database needs to be refreshed. This can be achieved by a reboot or
by using adb to manually refresh it.</p>
<div class="sourceCode" id="cb14"><pre
class="sourceCode sh"><code class="sourceCode bash"><span id="cb14-1"><a href="#cb14-1" aria-hidden="true" tabindex="-1"></a><span class="fu">sudo</span> dnf install adb</span></code></pre></div>
<p>Connect the Android device via USB and see if it is listed.</p>
<div class="sourceCode" id="cb15"><pre
class="sourceCode sh"><code class="sourceCode bash"><span id="cb15-1"><a href="#cb15-1" aria-hidden="true" tabindex="-1"></a><span class="ex">adb</span> devices</span></code></pre></div>
<p>If it is, restart adb in TCP mode with port 5555</p>
<div class="sourceCode" id="cb16"><pre
class="sourceCode sh"><code class="sourceCode bash"><span id="cb16-1"><a href="#cb16-1" aria-hidden="true" tabindex="-1"></a><span class="ex">adb</span> tcpip 5555</span></code></pre></div>
<p>Connect to the device using its <ip_address>.</p>
<div class="sourceCode" id="cb17"><pre
class="sourceCode sh"><code class="sourceCode bash"><span id="cb17-1"><a href="#cb17-1" aria-hidden="true" tabindex="-1"></a><span class="ex">adb</span> connect <span class="op">&lt;</span>ip_address<span class="op">&gt;</span></span></code></pre></div>
<p>Refresh MediaStore.</p>
<div class="sourceCode" id="cb18"><pre
class="sourceCode sh"><code class="sourceCode bash"><span id="cb18-1"><a href="#cb18-1" aria-hidden="true" tabindex="-1"></a><span class="ex">adb</span> shell am broadcast <span class="at">-a</span> android.intent.action.MEDIA_SCANNER_SCAN <span class="at">-d</span> file:///data/data/com.termux/files/home/storage/music/</span></code></pre></div>
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