Inspect ext Filesystems With tune2fs -l

Read superblock settings like UUID, reserved blocks and error behaviour.

LinuxFilesdiskDiagnosticsMedium risk

Run sudo tune2fs -l /dev/sda1 to print the ext filesystem parameters.

01Command

Command

$ sudo tune2fs -l /dev/sda1

02What it does

The read-only -l mode shows the filesystem UUID, feature flags, reserved block percentage and mount statistics, which are needed when scripting mounts or diagnosing disk-full surprises. It is the command-line view of filesystem metadata.

03Risk

RiskMedium risk

Requirementssudo apt install e2fsprogs

!Warning: Use only the read-only -l form unless you understand the write options; changing them can affect data.

04Undo

✓No undo needed — this command does not change persistent state.

05Sources

tune2fs.8.en.html manual page (Debian bookworm)
Debian · technical · 2026-09-20
Evidence: Documents tune2fs -l, which lists filesystem superblock information.

Last verified: 2026-10-13 · Category: System & Settings

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