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doc: add rename command page (#1781)

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Bruno Heridet
2020-05-14 02:36:08 +02:00
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# rename
Use `rename` to give columns more appropriate names.
## Examples
```shell
> open /etc/passwd | lines | split-column ":" | rename user password uid gid gecos home shell
────┬────────┬──────────┬──────┬──────┬────────┬─────────────────┬──────────────────
# │ user │ password │ uid │ gid │ gecos │ home │ shell
────┼────────┼──────────┼──────┼──────┼────────┼─────────────────┼──────────────────
0 │ root │ x │ 0 │ 0 │ root │ /root │ /bin/bash
1 │ bin │ x │ 1 │ 1 │ bin │ /bin │ /usr/bin/nologin
2 │ daemon │ x │ 2 │ 2 │ daemon │ / │ /usr/bin/nologin
3 │ mail │ x │ 8 │ 12 │ mail │ /var/spool/mail │ /usr/bin/nologin
────┴────────┴──────────┴──────┴──────┴────────┴─────────────────┴──────────────────
```