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<h2>Linux</h2>
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<h1 id="black-screen-and-lightdm-doesnt-unlock">Black screen and LightDM doesn't unlock</h1>
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<p>Add this to your /etc/lightdm/lightdm.conf file:</p>
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<div class="highlight"><div style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4">
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<table style="border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2
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</span></code></pre></td>
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<td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-cfg" data-lang="cfg"><span style="color:#66d9ef">[LightDM]</span>
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<span style="color:#a6e22e">logind-check-graphical</span><span style="color:#f92672">=</span><span style="color:#e6db74">true</span>
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</code></pre></td></tr></table>
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</div>
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</div><h1 id="edit-previous-commands">Edit previous commands</h1>
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<p><code>fc</code> is a shell builtin to list and edit previous commands in an editor.
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In addition to editing a single line (which you can also do with <code>C-x C-e</code>), it also allows you to edit and run several lines at the same time.
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You use it like this:</p>
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<p>List previous commands</p>
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<div class="highlight"><div style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4">
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<table style="border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">4
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">5
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</span></code></pre></td>
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<td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">$ fc -l
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<span style="color:#ae81ff">10259</span> nvim deploy.sh
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10260* cd ..
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10261* nvim content/cheatsheet/linux.md
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<span style="color:#ae81ff">10262</span> cd
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</code></pre></td></tr></table>
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</div>
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</div><p>List commands with date (in zsh)</p>
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<div class="highlight"><div style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4">
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<table style="border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">4
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">5
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</span></code></pre></td>
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<td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">$ fc -ld
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10260* 19:38 cd ..
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10261* 19:38 nvim content/cheatsheet/linux.md
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<span style="color:#ae81ff">10262</span> 19:40 cd
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<span style="color:#ae81ff">10263</span> 19:40 fc -l
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</code></pre></td></tr></table>
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</div>
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</div><p>You can add the date too:</p>
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<div class="highlight"><div style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4">
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<table style="border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3
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</span><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">4
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</span></code></pre></td>
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<td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">$ fc -fld
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<span style="color:#ae81ff">10262</span> 1/10/2019 19:40 cd
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<span style="color:#ae81ff">10263</span> 1/10/2019 19:40 fc -l
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<span style="color:#ae81ff">10264</span> 1/10/2019 19:40 fc -ld
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</code></pre></td></tr></table>
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</div>
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</div><p>You can edit a range of commands</p>
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<div class="highlight"><div style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4">
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<table style="border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1
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</span></code></pre></td>
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<td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">$ fc <span style="color:#ae81ff">10262</span> <span style="color:#ae81ff">10264</span>
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</code></pre></td></tr></table>
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</div>
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</div><p>The range can be relative to the current position, so the previous command is equivalent to:</p>
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<div class="highlight"><div style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4">
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<table style="border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1
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</span></code></pre></td>
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<td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">$ fc -3 -1
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</code></pre></td></tr></table>
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</div>
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</div><p>If you save and exit, all commands are executed as a script, and it will be added to your history.</p>
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<p>Source: <a href="https://shapeshed.com/unix-fc/">https://shapeshed.com/unix-fc/</a></p>
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<h1 id="prevent-logoff-from-killing-tmux-sessions">Prevent logoff from killing tmux sessions</h1>
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<p>Lately I've noticed that logging out of i3, intentionally or when i3 fails, would also kill any tmux or emacs sessions.
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This is extremely annoying.</p>
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<p>This is caused by a new default in logind (systemd's login) to kill user process on logoff.
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You can revert this setting in your logind.conf (<code>/etc/systemd/logind.conf</code>):</p>
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<div class="highlight"><div style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4">
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<table style="border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1
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</span></code></pre></td>
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<td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-cfg" data-lang="cfg"><span style="color:#a6e22e">KillUserProcesses</span><span style="color:#f92672">=</span><span style="color:#e6db74">no</span>
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</code></pre></td></tr></table>
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</div>
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</div><p>Or only for a specific process (e.g., tmux):</p>
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<div class="highlight"><div style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4">
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<table style="border-spacing:0;padding:0;margin:0;border:0;width:auto;overflow:auto;display:block;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code><span style="margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1
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</span></code></pre></td>
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<td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%">
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<pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">systemd-run --scope --user tmux
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</code></pre></td></tr></table>
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</div>
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</div><p>Source: <a href="https://unix.stackexchange.com/questions/490267/prevent-logoff-from-killing-tmux-session">https://unix.stackexchange.com/questions/490267/prevent-logoff-from-killing-tmux-session</a></p>
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<h3>Contents:</h3>
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<nav id="TableOfContents">
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<ul>
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<li><a href="#black-screen-and-lightdm-doesnt-unlock">Black screen and LightDM doesn't unlock</a></li>
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<li><a href="#edit-previous-commands">Edit previous commands</a></li>
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<li><a href="#prevent-logoff-from-killing-tmux-sessions">Prevent logoff from killing tmux sessions</a></li>
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</ul>
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J. Fernando Sánchez Rada | balkian
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