How can I permanently enable line numbers in IntelliJ?

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

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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…

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