config() { NEW="$1" OLD="$(dirname $NEW)/$(basename $NEW .new)" # If there's no config file by that name, mv it over: if [ ! -r $OLD ]; then mv $NEW $OLD elif [ "$(cat $OLD | md5sum)" = "$(cat $NEW | md5sum)" ]; then # toss the redundant copy rm $NEW fi # Otherwise, we leave the .new copy for the admin to consider... } config etc/fish/config.fish.new # add Fish to /etc/shells grep -qe '^/usr/bin/fish$' /etc/shells || echo '/usr/bin/fish' >> /etc/shells