<p>The same way as <a class="user-mention" data-hovercard-user-id="181177" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/codebrainz">@codebrainz</a>'s suggestion, you can get this to work easily with <code>sed</code>:</p>
<div class="highlight highlight-source-shell"><pre>sed -n <span class="pl-s"><span class="pl-pds">'</span>1~2p<span class="pl-pds">'</span></span></pre></div>
<p>Replace <code>1</code> with the starting line, and <code>2</code> with the step you want -- here it does exactly what you asked for, print every second line starting at line 1, effectively giving every odd line.</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/geany/geany-plugins/issues/772#issuecomment-419967392">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/ABDrJ1dXGQAKQdco4W1jOLusNjYQtzEEks5uZo3tgaJpZM4WhBH5">mute the thread</a>.<img src="https://github.com/notifications/beacon/ABDrJymEAJtfjVZQ_-8q9Ov3nCWigflXks5uZo3tgaJpZM4WhBH5.gif" height="1" width="1" alt="" /></p>
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