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post_install() { getent passwd btpd > /dev/null 2>&1 || \ useradd -r -m -d /var/lib/btpd -s /bin/nologin btpd } post_upgrade() { post_install } post_remove() { getent passwd btpd > /dev/null 2>&1 && \ userdel -r btpd > /dev/null 2>&1 }