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40 lines
1.1 KiB
Plaintext
40 lines
1.1 KiB
Plaintext
---
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syntax: markdown
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tags: [tldr, common]
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source: https://github.com/tldr-pages/tldr.git
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---
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# uniq
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> Output the unique lines from a input or file.
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> Since it does not detect repeated lines unless they are adjacent, we need to sort them first.
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> See also: `sort`.
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> More information: <https://www.gnu.org/software/coreutils/manual/html_node/uniq-invocation.html>.
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- Display each line once:
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`sort {{path/to/file}} | uniq`
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- Display only unique lines:
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`sort {{path/to/file}} | uniq {{[-u|--unique]}}`
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- Display only duplicate lines:
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`sort {{path/to/file}} | uniq {{[-d|--repeated]}}`
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- Display number of occurrences of each line along with that line:
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`sort {{path/to/file}} | uniq {{[-c|--count]}}`
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- Display number of occurrences of each line, sorted by the most frequent:
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`sort {{path/to/file}} | uniq {{[-c|--count]}} | sort {{[-nr|--numeric-sort --reverse]}}`
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- Compare only the first 10 characters on each line for uniqueness:
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`sort {{path/to/file}} | uniq {{[-w|--check-chars]}} 10`
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- Compare text after the first 5 characters on each line for uniqueness:
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`sort {{path/to/file}} | uniq {{[-s|--skip-chars]}} 5`
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