post_install() {
grep -q '/usr/bin/ash' etc/shells || echo '/usr/bin/ash' >> etc/shells
grep -q '/usr/bin/dash' etc/shells || echo '/usr/bin/dash' >> etc/shells
}
post_upgrade() {
post_install
}
pre_remove() {
sed -i '/^\/usr\/bin\/ash/d' etc/shells
sed -i '/^\/usr\/bin\/dash/d' etc/shells
}