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tune2fs

Adjust parameters of an ext2, ext3 or ext4 filesystem.

May be used on mounted filesystems.

More information.

Set the max number of counts before a filesystem is checked to 2:

tune2fs -c {2} {/dev/sdXN}

Set the filesystem label to MY_LABEL:

tune2fs -L {'MY_LABEL'} {/dev/sdXN}

Enable discard and user-specified extended attributes for a filesystem:

tune2fs -o {discard,user_xattr} {/dev/sdXN}

Enable journaling for a filesystem:

tune2fs -o^{nobarrier} {/dev/sdXN}

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