After doing (in my case):
sudo umount /dev/sdb
(result) umount: /dev/sdb: not mounted
sudo parted /dev/sdb unit % resizepart 2 100 unit MB print
Warning: Partition /dev/sdb2 is being used. Are you sure you want to continue?
parted: invalid token: 100
Yes/No?
Does one ignore both warnings?
sudo umount /dev/sdb
(result) umount: /dev/sdb: not mounted
sudo parted /dev/sdb unit % resizepart 2 100 unit MB print
Warning: Partition /dev/sdb2 is being used. Are you sure you want to continue?
parted: invalid token: 100
Yes/No?
Does one ignore both warnings?