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Uniq

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Man page:uniq

Usage

Report or omit repeated lines.

shell

uniq OPTION INPUT OUTPUT

Option	Description
`-i` `--ignore-case`	Ignore differences in case when comparing.
`-z` `--zero-terminated`	line delimiter is `NUL`, not newline.

Sort and remove repeated lines. In this case using sort -u would be better, though.

shell

sort input.txt | uniq