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https://github.com/RGBCube/serenity
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49 lines
1.4 KiB
Markdown
49 lines
1.4 KiB
Markdown
## Name
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uniq - filter out repeated adjacent lines
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## Synopsis
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```**sh
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$ uniq [-c] [-d|-u] [-f skip-fields] [-s skip-chars] [--version] [INPUT] [OUTPUT]
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```
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## Description
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Filter out repeated adjacent lines from INPUT (or standard input) and write to OUTPUT (or standard output). It is recommended to sort out the input using [`sort(1)`](help://man/1/sort) beforehand.
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## Options
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* `-c`, `--count`: Precede each line with its number of occurrences.
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* `-d`, `--repeated`: Only print repeated lines.
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* `-u`, `--unique`: Only print unique lines (default).
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* `-f N`, `--skip-fields N`: Skip first N fields of each line before comparing.
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* `-c N`, `--skip-chars N`: Skip first N chars of each line before comparing.
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* `--help`: Display help message and exit.
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* `--version`: Print version.
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## Examples
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Filter out repeated lines from README.md and write to standard output:
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```sh
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$ uniq README.md
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```
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Filter out repeated lines from README.md and write to UNIQUE.md:
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```sh
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$ uniq README.md UNIQUE.md
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```
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Filter out repeated lines from standard input with their occurrence count:
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```sh
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$ echo "Well\nWell\nWell\nHello Friends!" | uniq -c
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3 Well
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1 Hello Friends!
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```
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Filter out repeated lines, ignoring the first field ("XXXX" and "ZZZZ") and the four chars after it (" ABC" and " BCA", thus comparing only the "D"s — which are equal indeed):
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```sh
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$ echo "XXXX ABCD\nZZZZ BCAD" | uniq -f1 -s4
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ZZZZ BCAD
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```
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