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# old version (without -$pkgrel): ${1%%-*} # new version (without -$pkgrel): ${2%%-*} post_install() { echo 'DKMS install...' dkms install evdi/${1%%-*} } pre_upgrade() { pre_remove ${2%%-*} } post_upgrade() { post_install ${1%%-*} } pre_remove() { echo 'DKMS remove...' dkms remove evdi/${1%%-*} --all }