How can I permanently enable line numbers in IntelliJ?

Question

IntelliJ 14.X Onwards

From version 14.0 onwards, the path to the setting dialog is slightly different, a General submenu has been added between Editor and Appearance as shown below

IntelliJ 8.1.2 - 13.X

From IntelliJ 8.1.2 onwards, this option is in File | Settings¹. Within the IDE Settings section of that dialog, you'll find it under Editor | Appearance.

1. On a Mac, these are named IntelliJ IDEA | Preferences...

The question is obviously well answered already, but since IJ 13 you can enable line numbers in 2 seconds flat:

1. Press shift twice
2. Type "line number"
3. The option shows in the menu and press enter to enable/disable.

Et voila ;)

NOT a solution, rather a TEMPORARY solution which only works only for the current editor and current session:

Simply right click on the place where the line-numbers should be, and there you'll see a small menu.

then, mark the "Show Line Numbers" option.

Please note that this only works on a per-file basis, however. Enjoy.

In Intellij 13 the layout has changed, the Settings button can only be found in File -> Settings and not in the toolbars, and from there you follow the same steps: Editor -> Appearance -> Show line numbers, or search for Line numbers in the Settings search input.

Android Studio 1.3.2 and on, IntelliJ 15 and on

Global configuration

File -> Settings -> Editor -> General -> Appearance -> Show line numbers

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Current editor configuration

First way: View -> Active Editor -> Show Line Numbers (this option will only be available if you previously have clicked into a file of the active editor)

Second way: Right click on the small area between the project's structure and the active editor (that is, the one that you can set breakpoints) -> Show Line Numbers.