df: add support for --total option #3197
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Change the signature of `DisplayRow::new()` to borrow `Row` instead of consuming it, so that the `Row` can be used after it is displayed.
Add support for the `--total` option to `df`, which displays the total
of each numeric column. For example,
$ df --total
Filesystem 1K-blocks Used Available Use% Mounted on
udev 3858016 0 3858016 0% /dev
...
/dev/loop14 63488 63488 0 100% /snap/core20/1361
total 258775268 98099712 148220200 40% -
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This pull request adds support for the
--totaloption todf, which displays the total of each numeric column. For example,