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slackupdr automates the use of slackpkg, manages installation of multiple kernels & updates LILO & ELILO bootloaders. The script expects to be run as the root user. slackupdr is menu & config file driven. it is on https://slackbuilds.org/repository/15.0/system/slackupdr/?search=slackupdr once installed you will need to create a mkinitrd.conf

cp /etc/mkinitrd.conf.sample /etc/mkinitrd.conf

and then simply run slackupdr as root

slackupdr