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# old version (without -$pkgrel): ${1%%-*} # new version (without -$pkgrel): ${2%%-*} post_install() { dkms install v4l2loopback/${1%%-*} } pre_upgrade() { pre_remove ${2%%-*} } post_upgrade() { post_install ${1%%-*} } pre_remove() { dkms remove v4l2loopback/${1%%-*} --all }