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    <p>Update November 2015: </p> <h2>In Eclipse Mars 4.5.1, line numbers are (annoyingly) turned off by default again. Follow the below instructions to enable it.</h2> <hr> <p>Update December 2013: </p> <p><a href="http://www.vogella.com/people/larsvogel.html" rel="nofollow noreferrer">Lars Vogel</a> just <a href="http://blog.vogella.com/2013/12/10/line-numbers-are-default-in-eclipse-sdk-luna-as-of-today/" rel="nofollow noreferrer">published on his blog</a>:</p> <h2>Line numbers are default in Eclipse SDK Luna (4.4) as of today</h2> <p>(December 10, 2013)</p> <blockquote> <p>We conducted a user survey if users want to have line numbers activated in text editors in the Eclipse IDE by default.<br> The response was very clear:</p> </blockquote> <pre><code>YES : 80.07% (1852 responses) NO : 19.93% (461 responses) Total : 2313 Skipped: 15 </code></pre> <blockquote> <p>With <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=421313" rel="nofollow noreferrer">Bug 421313</a>, <a href="https://git.eclipse.org/r/#/c/18233/" rel="nofollow noreferrer">Review - Line number should be activated by default</a>, we enabled it for the Eclipse SDK build, I assume other Eclipse packages will follow.</p> </blockquote> <hr> <p>Update August 2014</p> <p><strong>Line number default length</strong> is now <strong>120</strong> (instead of 80) for Eclipse Mars 4.5M1.<br> See "<a href="https://stackoverflow.com/a/25250064/6309">How to customize Eclipse's text editor code formating</a>".</p> <hr> <p>Original answer (March 2009)</p> <p>To really have it by default, you can write a script which ensure, before launching eclipse, that:<br> <strong><code>[workspace]\.metadata\.plugins\org.eclipse.core.runtime\.settings\org.eclipse.ui.editors.prefs</code></strong> does contain:</p> <pre><code>lineNumberRuler=true </code></pre> <p>(with <code>[workspace]</code> being the root directory of your eclipse workspace)<br> Then eclipse will be opened with "line numbers shown 'by default' "</p> <hr> <p>Otherwise, you can also type 'CTRL+1' and then "line", which will give you access to the command "Show line numbers"<br> (that will switch to option "show line numbers" in the text editors part of the option.</p> <p>Or you can just type "numb" in Windows Preferences to access to the Text Editor part:</p> <p><img src="https://i.stack.imgur.com/DY3h7.png" alt="show line number"></p> <p><sup>Picture from "<a href="http://www.mkyong.com/eclipse/how-to-display-line-numbers-in-eclipse/" rel="nofollow noreferrer">How to display line numbers in Eclipse</a>" of blog "<a href="http://www.mkyong.com/" rel="nofollow noreferrer">Mkyong.com</a>"</sup></p>
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