3 ms·set -x fish_greeting ""by tyilo 13y agoset -x fish_greeting ""donri 13y agoYou probably meant set -U because you probably don't want to export fish_greeting to child processes. fish_greeting is already universal though and you don't need the empty string to unset it. This is enough: set fish_greetingaeosynth 13y agoset -e fish_greeting -e to erase