Please check my sudo bash script

[Tom Browder <tom.browder@gmail.com>]

I just added three new SSD and want to prep them for use.

I plan to use a script to do that incrementally. Given the disks show
the following when running "lsblk -o ..." ('#  ' added):

# NAME     SIZE FSTYPE MOUNTPOINT
# sda      3.6T                   # <= new disk   sda
# sdb    465.8G
# |-sdb1   512M vfat   /boot/efi
# |-sdb2 464.3G ext4   /
# `-sdb3   976M swap   [SWAP]
# sdc    931.5G                   # <= new disk   sdc
# sdd    931.5G                   # <= new disk   sdd

Does this bash fragment look safe for using bash vars for the first disk:

SDX=sda
sudo parted /dev/${SDX} mklabel gpt
sudo parted -a opt /dev/${SDX} mkpart primary ext4=0% 100%
sudo mkfs.ext4 /dev/${SDX}

Thanks.

-Tom