How can I show line numbers in Eclipse?

Question

How can I show line numbers by default in Eclipse?

Answer 1

Windows → Preferences → General → Text Editors → Show numberlines

Answer 2

click on window tab and click on preferences

do this and check show line number

Answer 3

Update November 2015:

In Eclipse Mars 4.5.1, line numbers are (annoyingly) turned off by default again. Follow the below instructions to enable it.

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Update December 2013:

Lars Vogel just published on his blog:

Line numbers are default in Eclipse SDK Luna (4.4) as of today

(December 10, 2013)

We conducted a user survey if users want to have line numbers activated in text editors in the Eclipse IDE by default.
The response was very clear:

YES : 80.07% (1852 responses)
NO  : 19.93% (461 responses)
Total  : 2313
Skipped:   15

With Bug 421313, Review - Line number should be activated by default, we enabled it for the Eclipse SDK build, I assume other Eclipse packages will follow.

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Update August 2014

Line number default length is now 120 (instead of 80) for Eclipse Mars 4.5M1.
See "How to customize Eclipse's text editor code formating".

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Original answer (March 2009)

To really have it by default, you can write a script which ensure, before launching eclipse, that:
[workspace]\.metadata\.plugins\org.eclipse.core.runtime\.settings\org.eclipse.ui.editors.prefs does contain:

lineNumberRuler=true

(with [workspace] being the root directory of your eclipse workspace)
Then eclipse will be opened with "line numbers shown 'by default' "

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Otherwise, you can also type 'CTRL+1' and then "line", which will give you access to the command "Show line numbers"
(that will switch to option "show line numbers" in the text editors part of the option.

Or you can just type "numb" in Windows Preferences to access to the Text Editor part:

^{Picture from "How to display line numbers in Eclipse" of blog "Mkyong.com"}

Answer 4

On a Mac do this:

cmd + , or ADT -> Preferences 

Expand General -> Editors ->Text Editors

Check box: Show line numbers

Answer 5

one of the easy way is using shortcuts like : Ctrl+F10, then press n "it show line number and hide line numbers.

Answer 6

Slight variation on Mac OSX:
Eclipse → Preferences → General → Editors → Text Editors → Show line numbers