$ curl cheat.sh/
# debugfs
# An interactive ext2/ext3/ext4 filesystem debugger.
# More information: <https://manned.org/debugfs>.

# Open the filesystem in read only mode:
debugfs /dev/sdXN

# Open the filesystem in read write mode:
debugfs -w /dev/sdXN

# Read commands from a specified file, execute them and then exit:
debugfs -f path/to/cmd_file /dev/sdXN

# View the filesystem stats in debugfs console:
stats

# Close the filesystem:
close -a

# List all available commands:
lr

$
Follow @igor_chubin cheat.sh tldr