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# Unmounting

To unmount an S3QL file system, use the command:

    umount.s3ql [options] <mountpoint>

This will block until all data has been written to the backend.

Only the user who mounted the file system with mount.s3ql is able to unmount it again. If you are root and want to unmount an S3QL file system mounted by an ordinary user, you have to use the fusermount -u or umount command instead. Note that these commands do not block until all data has been uploaded, so if you use them instead of `umount.s3ql` then you should manually wait for the `mount.s3ql` process to terminate before shutting down the system.

The umount.s3ql command accepts the following options:

> `--debug` | activate debugging output
> `--quiet` | be really quiet
> `--version` | just print program version and exit
> `--lazy, -z` | Lazy umount. Detaches the file system immediately, even if there are still open files. The data will be uploaded in the background once all open files have been closed.

If, for some reason, the `umount.sql` command does not work, the file system can also be unmounted with `fusermount -u -z`. Note that this command will return immediately and the file system may continue to upload data in the background for a while longer.

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