`resize2fs` - ext2/ext3/ext4 file system resizer

resize2fs [options] DEVICE [SIZE]

Options you will use

-p: Print a progress bar.

Gotchas

Without SIZE it grows the file system to fill the partition or logical volume. ext4 can grow while mounted.

Try resize2fs in a real terminal Free, in your browser - a real Ubuntu terminal to try it in, with missions that check your work.