Erase all, create single partition ( terminal )

sfdisk CLI non-interactive method

echo 'start=2048, type=83' | sudo sfdisk /dev/sdX
sudo mkfs.ext4 /dev/sdX1

erases all data, and creates a single partition that takes up all USB with an ext4 filesystem.

Choose X based on the output of:

sudo lsblk
sudo fdisk -l

For more detailed description of sfdisk see: https://superuser.com/questions/332252/creating-and-formating-a-partition-using-a-bash-script/1132834#1132834

fdisk automation

It is also possible to do the same as above with:

printf 'o\nn\np\n1\n\n\nw\n' | sudo fdisk /dev/sdX

but this method is less maintainable than sfdisk, which was designed for Scripting fdisk, specially if you want to create more complex partition tables.