blocks used by a filesystem

[Robert Citek]

I want to know the number of blocks used by a filesystem on partition
${part_slash}. Here's one way:

e2fsck -n ${part_slash} 2> /dev/null | grep blocks | cut -d, -f3 | cut -d/ -f1

However, I suspect that I will have difficulty understanding what that
does in 6 months. Anyone have a more elegant and readable suggestion?

Regards,
- Robert
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[Robert Citek]

On Wed, Jan 30, 2013 at 2:18 PM, Andrew Freiberger

tune2fs ${part_slash} |grep -i block
will give you lots of good info w/out the fsck.

Agreed, tune2fs gives lots of good information. For the number of used blocks:

maxblocks=$(tune2fs -l /dev/sda1 | grep '^Block count' | cut -d: -f2)
freeblocks=$(tune2fs -l /dev/sda1 | grep '^Free blocks' | cut -d: -f2)
echo $(($maxblocks-$freeblocks))

It's definitely more verbose than the one-liner, although I'm not sure
that it's any more readable.

Sure would be nice if tune2fs output its data in some structured
format, e.g. JSON.

Regards,
- Robert
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