# Check unmounted filesystem on /dev/sda1 with (potentially many) interactive prompts for each fix.
e2fsck /dev/sda1

# Automatically repair minor issues without prompts
e2fsck -p /dev/sda1

# Check only (do not repair anything)
e2fsck -n /dev/sda1

# Force check even if filesystem is clean
e2fsck -f /dev/sda1

# Display a progress bar during e2fsck
e2fsck -f -C 0 /dev/sda1