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nushell/docs/commands/uniq.md
siedentop bce6f5a3e6
Uniq: --count flag to count occurences (#2017) 
* uniq: Add counting option (WIP!)

Usage:

fetch https://raw.githubusercontent.com/timbray/topfew/master/test/data/access-1k | lines | wrap item | uniq | sort-by count | last 10

* uniq: Add first test

* uniq: Re-enable the non-counting variant.

* uniq: Also handle primitive lines.

* uniq: Update documentation

* uniq: Final comment about error handling. Let's get some feedback

* uniq: Address review comments.

Not happy with the way I create a TypeError. There must be a cleaner
way. Anyway, good for shipping.

* uniq: Use Labeled_error as suggested by jturner in chat.

* uniq: Return error directly.

Co-authored-by: Christoph Siedentop <christoph@siedentop.name>
2020-06-21 12:22:06 +12:00

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uniq

Returns unique rows or values from a dataset.

Examples

Given a file test.csv

first_name,last_name,rusty_at,type
Andrés,Robalino,10/11/2013,A
Andrés,Robalino,10/11/2013,A
Jonathan,Turner,10/12/2013,B
Yehuda,Katz,10/11/2013,A

> `open test.csv | uniq`
━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━
 # │ first_name │ last_name │ rusty_at   │ type
───┼────────────┼───────────┼────────────┼──────
 0 │ Andrés     │ Robalino  │ 10/11/2013 │ A
 1 │ Jonathan   │ Turner    │ 10/12/2013 │ B
 2 │ Yehuda     │ Katz      │ 10/11/2013 │ A
━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━

> `open test.csv | get type | uniq`
━━━┯━━━━━━━━━
 # │ <value>
───┼─────────
 0 │ A
 1 │ B
━━━┷━━━━━━━━━

Counting

--count or -c is the flag to output a count column.

> `open test.csv | get type | uniq -c`
───┬───────┬───────
 # │ value │ count 
───┼───────┼───────
 0 │ A     │     3 
 1 │ B     │     2 
───┴───────┴───────