dracut/modules.d/98dracut-systemd/dracut-cmdline-ask.sh

#!/bin/bash

sleep 0.5
echo
sleep 0.5
echo
sleep 0.5
echo
echo
echo
echo
echo "Enter additional kernel command line parameter (end with ctrl-d or .)"
while read -e -p "> " line || [ -n "$line" ]; do
    [[ "$line" == "." ]] && break
    [[ "$line" ]] && printf -- "%s\n" "$line" >> /etc/cmdline.d/99-cmdline-ask.conf
done

exit 0
Add "rd.cmdline=ask" kernel command line parameter prompts the user for additional kernel command line parameters 11 years ago			`#!/bin/bash`

			`sleep 0.5`
			`echo`
			`sleep 0.5`
			`echo`
			`sleep 0.5`
			`echo`
			`echo`
			`echo`
			`echo`
			`echo "Enter additional kernel command line parameter (end with ctrl-d or .)"`
change "while read x" to cope with EOF without newline while read x \|\| [ -n "$x" ] should do the trick 10 years ago			`while read -e -p "> " line \|\| [ -n "$line" ]; do`
Add "rd.cmdline=ask" kernel command line parameter prompts the user for additional kernel command line parameters 11 years ago			`[[ "$line" == "." ]] && break`
			`[[ "$line" ]] && printf -- "%s\n" "$line" >> /etc/cmdline.d/99-cmdline-ask.conf`
			`done`

			`exit 0`