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Document pivot command

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Part of https://github.com/nushell/nushell/issues/711
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# pivot
Pivots the table contents so rows become columns and columns become rows.
## Examples
```sh
> ls docs
━━━┯━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━━━━━━━━
# │ name │ type │ readonly │ size │ accessed │ modified
───┼────────────────────┼───────────┼──────────┼────────┼─────────────┼─────────────
0 │ docs/commands │ Directory │ │ 4.1 KB │ an hour ago │ an hour ago
1 │ docs/docker.md │ File │ │ 7.0 KB │ an hour ago │ a day ago
2 │ docs/philosophy.md │ File │ │ 896 B │ an hour ago │ a day ago
━━━┷━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━━━━━━━━
> ls docs | pivot
━━━┯━━━━━━━━━━┯━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━
# │ Column0 │ Column1 │ Column2 │ Column3
───┼──────────┼───────────────┼────────────────┼────────────────────
0 │ name │ docs/commands │ docs/docker.md │ docs/philosophy.md
1 │ type │ Directory │ File │ File
2 │ readonly │ │ │
3 │ size │ 4.1 KB │ 7.0 KB │ 896 B
4 │ accessed │ an hour ago │ an hour ago │ an hour ago
5 │ modified │ an hour ago │ a day ago │ a day ago
━━━┷━━━━━━━━━━┷━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━
```
Use `--header-row` to treat the first row as column names:
```shell
> ls docs | pivot --header-row
━━━┯━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━
# │ docs/commands │ docs/docker.md │ docs/philosophy.md
───┼───────────────┼────────────────┼────────────────────
0 │ Directory │ File │ File
1 │ │ │
2 │ 4.1 KB │ 7.0 KB │ 896 B
3 │ an hour ago │ an hour ago │ an hour ago
4 │ an hour ago │ a day ago │ a day ago
━━━┷━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━
```
Use `--ignore-titles` to prevent pivoting the column names into values:
```shell
> ls docs | pivot --ignore-titles
━━━┯━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━
# │ Column0 │ Column1 │ Column2
───┼───────────────┼────────────────┼────────────────────
0 │ docs/commands │ docs/docker.md │ docs/philosophy.md
1 │ Directory │ File │ File
2 │ │ │
3 │ 4.1 KB │ 7.0 KB │ 896 B
4 │ an hour ago │ an hour ago │ an hour ago
5 │ an hour ago │ a day ago │ a day ago
━━━┷━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━
```
Additional arguments are used as column names:
```shell
> ls docs | pivot foo bar baz
━━━┯━━━━━━━━━━┯━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━
# │ foo │ bar │ baz │ Column3
───┼──────────┼───────────────┼────────────────┼────────────────────
0 │ name │ docs/commands │ docs/docker.md │ docs/philosophy.md
1 │ type │ Directory │ File │ File
2 │ readonly │ │ │
3 │ size │ 4.1 KB │ 7.0 KB │ 896 B
4 │ accessed │ 2 hours ago │ 2 hours ago │ 2 hours ago
5 │ modified │ 2 hours ago │ a day ago │ a day ago
━━━┷━━━━━━━━━━┷━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━
```