oh-my-fish/tools/ci-install-fish.sh

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#!/usr/bin/env bash
set -o pipefail
set -o errexit
set -o nounset
if [[ $FISH_RELEASE = "brew" ]]; then
brew update
brew install fish
else
if [[ $FISH_RELEASE == "2" ]]; then
REPO_PPA="ppa:fish-shell/release-2"
else
REPO_PPA="ppa:fish-shell/release-3"
fi
if [[ $FISH_RELEASE != "stock" ]]; then
sudo apt-add-repository -y $REPO_PPA
fi
sudo apt-cache policy fish
sudo apt-get update
sudo apt-get install -y fish
fi
fish --version