# fsck

> Check the integrity of a filesystem or repair it. The filesystem should be unmounted at the time the command is run.

- Check filesystem /dev/sda, reporting any damaged blocks:

`fsck {{/dev/sda}}`

- Check filesystem /dev/sda, reporting any damaged blocks and interactively letting the user choose to repair each one:

`fsck -r {{/dev/sda}}`

- Check filesystem /dev/sda, reporting any damaged blocks and automatically repairing them:

`fsck -a {{/dev/sda}}`