Some functions I was using on one of my scripts, but no longer use.

pre_anergos.old.sh

#!/usr/bin/env bash
# License: GNU GPLv3

# setfont sun12x22 #HDPI
# dd bs=4M if=path/to/archlinux.iso of=/dev/sdx status=progress oflag=sync

get_drive() {
    # Sata and NVME drives array
    drives=( $(/usr/bin/ls -1 /dev | grep -P "sd.$|nvme.*$" | grep -v "p.$") )

	# "NUM drive" for dialog prompt. Starts from 0 for compatibility with arrays
    local -i n=0
	for i in "${drives[@]}" ; do
		dialog_prompt="$dialog_prompt $n $i"
        ((n++))
	done

    # Prompts user to select one of the available sda or nvme drives.
    local dialogOUT
    dialogOUT=$(dialog --title "Select your Hard-drive" \
        --menu "$(lsblk)" 0 0 0 $dialog_prompt 3>&1 1>&2 2>&3 3>&1 ) || exit

    # Converts dialog output to the actuall name of the selected drive.
    echo "/dev/${drives[$dialogOUT]}"
}

get_drive() {
	# Asks user to select a /dev/sdX or /dev/nvme device and
	# returns the selected device.

    # Sata and NVME drives array
    drives=( $(/usr/bin/ls -1 /dev | grep -P "sd.$|nvme.*$" | grep -v "p.$") )

	# Enumerates every drive like so: 
	# 1 /dev/sda 2 /dev/sdb 3 /dev/sdc 4 /dev/nvme0n1 .....
    local -i n=0
	for i in "${drives[@]}" ; do
		dialog_prompt="$dialog_prompt $n $i"
        ((n++))
	done

    # Prompts user to select one of the available sda or nvme drives.
	local dialogOUT
	dialogOUT=$(dialog --title "Select your Hard-drive" \
        --menu "$(lsblk)" 0 0 0 $dialog_prompt 3>&1 1>&2 2>&3 3>&1 ) || exit 1

	HARD_DRIVE="/dev/${drives[$dialogOUT]}"
	[[ $HARD_DRIVE == *"nvme"* ]] && HARD_DRIVE="${HARD_DRIVE}p"

    # Converts dialog output to the actuall name of the selected drive.
    echo "$HARD_DRIVE"
}

dialog --yesno "Reboot computer?"  5 30 && reboot
dialog --yesno "Return to chroot environment?" 6 30 && arch-chroot /mnt