I disabled the character picker by reading this other question, but I want to remove that change and restore the picker.
When I type -g ApplePressAndHoldEnabled -bool true into Terminal, it does not work.
How can I re-enable the Press & Hold character picker after disabling it?
The command to enable the Press & Hold character picker is as follows:
defaults write -g ApplePressAndHoldEnabled -bool true
Note the addition of defaults write which was missing from your command.
If it does not work in certain apps after performing this, restart/reload those apps (e.g. killall -HUP Finder). Alternatively, log out of your user or just reboot your computer.
defaults write NSGlobalDomain ApplePressAndHoldEnabled -bool false is this also valid?
As grgarside mentioned
defaults write -g ApplePressAndHoldEnabled -bool true
will enable Press & Hold. But just in case anyone comes across this, this additional command will enable the Press & Hold functionality to work in Terminal as well which it does not do by default.
defaults write com.apple.terminal ApplePressAndHoldEnabled -bool true
A few years ago the techniques described above stopped working for me. I tried many permutations and combinations but no luck. I then noticed the problem seemed to be following me around, for example it was on my new Mac laptop. Yesterday I finally figured out what was wrong: I had selected "Irish - Extended" keyboard—when I switched to just "Irish" the press-and-hold character picker started working again. I don't know why it didn't work under "Irish - Extended", but I'm glad to have it back.
