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post_install() { if [ ! "`grep /usr/bin/fish etc/shells`" ]; then echo "updating /etc/shells... done." sed -i "s|/bin/bash|/bin/bash\n/usr/bin/fish|" etc/shells fi } post_upgrade() { post_install $1 } pre_remove() { echo -ne "updating /etc/shells... \n" sed -i '/^\/usr\/bin\/fish/d' /etc/shells }