'sfdisk'.md

echo 'start,size,type,bootable' | sfdisk /dev/sdx

default
start first available sector
size largest from start
type linux
bootable no

Create single partition

echo ',' | sfdisk /dev/sdx

Create single FAT partition

echo ',,c' | sfdisk /dev/sdx

Create 2 partitions: 2.4GB + the rest

echo -e ',2.4G\n,' | sfdisk /dev/sdx

Create 3 partitions: 2.4GB + 1.2GB + the rest

echo -e ',2.4G\n,1.2G\n,' | sfdisk /dev/sdx