How can I permanently enable line numbers in IntelliJ IDEA?
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intellij-idea
The answer is
Ok in intelliJ 14 Ultimate using the Mac version this is it.
IntelliJ Idea > Preferences > Editor > General > Appearance > Show Line Numbers
On Mac Intellij 12.1.2 there is no File-Settings:
There is an application-name menu item to the left of "File" with a "preferences" menu item:
and within that is the "Settings" dialog shown by the Windows Intellij.
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
Go to Android Studio => Preferences => Editor => General => Appearance => set Checked "Show line numbers"
For 9.0.4
File > Settings
In the tree view group
------------IDE Settings ---------
Click the Editor [+]
Select Appearance... Its there.
1st way: Go to View => Active Editor => show line numbers
2nd way Go to Android Studio => Preferences => Editor=> Appearance => set Checked "Show Line Numbers"
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.
- On a Mac, these are named IntelliJ IDEA | Preferences...
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.
For InteliJ IDEA 11.0 and above
Goto File --> Settings in the Settings window Editor --> Appearance
and tick Show line numbers check box.
Android Studio 1.3.2 and on, IntelliJ 15 and on
Global configuration
File -> Settings -> Editor -> General -> Appearance -> Show line numbers
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.
The question is obviously well answered already, but since IJ 13 you can enable line numbers in 2 seconds flat:
- Press shift twice
- Type "line number"
- The option shows in the menu and press enter to enable/disable.
Et voila ;)
On IntelliJ IDEA 2016.1.2
Go to Settings > Editor > General > Appearance then check the Show Line number option
IntelliJ 14 (Ubuntu):
See: how-do-i-turn-on-line-numbers-permanently-in-intellij-14
Permanently:
File > Settings > Editor > General > Appearance > show line numbers
For current Editor:
View > Active Editor > Show Line Numbers
IntelliJ IDEA 15
5 approaches
Global change
File > Settings... > Editor > General > Appearance > Show line numbers
Hit Shift twice > write "line numbers" > Show Line Numbers (that one that has the toggle) > change the toggle to ON
Change for the Active Editor
Right click on the left side bar > Show Line Numbers
Hit Shift twice > write "line" > Show Line Numbers (the line doesn't have the toggle)
Ctrl + Shift + A > write "Show line" > Active Editor: Show Line Numbers > change the toggle to ON
I add this response for IntelliJ IDEA 2018.2 - Ultimate.
Using menu
IntelliJ Idea > Preferences > Editor > General > Appearance > Show Line Numbers
Using Shortcuts - First way
For Windows : Ctrl+Shift+a
For Mac : Cmd+shift+a
Using Shortcuts - Seconde way
Touch Shift twice
These three methods exist since the last 4 versions of Intellij and I think they remain valid for a long time.
IntelliJ 2019 community edition has line number by default. If you want to show or hide line numbers, go to the following settings to change the appearance.
go to ? File ? Setting ? Editor ? General ? Appearance ? [Check] Show line numbers
On IntelliJ 12 on MAC OSX, I had a hard time finding it. The search wouldn't show me the way for some reason. Go to Preferences and under IDE Settings, Editor, Appearance and select 'Show line numbers'
I just hit this with IdeaVim plugin installed, where even if I set Show Line Numbers, it continued to revert to hiding them.
The (forehead-slapping-worthy) solution was:
:set nu
For IntelliJ 20.1 or above, on Mac OSX:
IntelliJ IDEA -> Editor -> General -> Appearance -> Show line numbers
Point to be noted: Always look for Editor
For shortcut:
? + ? + A (command + shift + A)
type 
and click on the pop up to turn on Show line numbers and you are good to go.
Just an update for Android Studio 1.5.1 on Windows:
Go to File -> Settings -> follow picture
In IntelliJ 14 it has moved again somewhat down the menu.
Now we have it unter Editor -> General -> Appearance
Source: Stackoverflow.com