uniq(1)

💖 uniq — the glow-up for your duplicate lines 💖

okay bestie, welcome to uniq(1), from the General Commands Manual section — yes it's a coreutils girlie and yes she's serving Report or omit repeated lines. that's the whole job description. she's not complicated, she's just precise. 🎀

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✨ NAME ✨

uniq — report or omit repeated lines. that's it. that's the brand. 💅

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✨ SYNOPSIS ✨

uniq [-D|--all-repeated] [--group] [-w|--check-chars] [-c|--count]
[-i|--ignore-case] [-d|--repeated] [-s|--skip-chars] [-f|--skip-fields]
[-u|--unique] [-z|--zero-terminated] [-h|--help] [-V|--version] [files]

like, look at her go. so many lil flags. so much power in one tiny command. 👑

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✨ DESCRIPTION ✨

Report or omit repeated lines.

fr fr that's the vibe. you feed her lines, she decides which ones get to stay. main character energy for text files. 🌸

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✨ OPTIONS ✨

okay here's the part you actually came for, bestie. every single flag, no skips, no gatekeeping:

• -D, --all-repeated[=<delimit-method>] — print all duplicate lines. delimiting is done with blank lines. [default: none]

possible values, bestie, pick your fighter:

• none
• prepend
• separate

• --group[=<group-method>] — show all items, separating groups with an empty line. [default: separate]

possible values:

• separate
• prepend
• append
• both

• -w, --check-chars <N> — compare no more than N characters in lines 👀 like, only look at the first N chars and ignore the rest, lowkey iconic
• -c, --count — prefix lines by the number of occurrences 🔢 she's counting. she's keeping receipts.
• -i, --ignore-case — ignore differences in case when comparing 🙈 HELLO and hello are the same girlie, no cap
• -d, --repeated — only print duplicate lines 👯 show me the twins only
• -s, --skip-chars <N> — avoid comparing the first N characters ✂️ skip past the intro, get to the real content
• -f, --skip-fields <N> — avoid comparing the first N fields 🚫 same energy but for whole fields, periodt
• -u, --unique — only print unique lines ⭐ the solo girlies, the ones with no duplicate
• -z, --zero-terminated — end lines with 0 byte, not newline 💀 yes really, null bytes, for the script girlies who need it
• -h, --help — Print help 🫶 she's helping
• -V, --version — Print version 🏷️ she's telling you who she is

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✨ EXTRA ✨

filter adjacent matching lines from INPUT (or standard input), writing to OUTPUT (or standard output). classic filter behaviour, no notes. 💜

⚠️ Note: uniq does not detect repeated lines unless they are adjacent. so if your duplicates are scattered all over the place, she literally cannot see them, bestie, that's not a bug that's just how she's built. 😭 you may want to sort the input first, or use sort -u without uniq.

that last bit is important!! if your file is messy, uniq will gaslight you into thinking there are no duplicates. sort first. iykyk. 🔥

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✨ VERSION ✨

v(uutils coreutils) 0.7.0 — that's the version tag, screenshot it, remember it. 🌈

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and that's the whole page, bestie!! uniq (uutils coreutils) 0.7.0 — she's from the General Commands Manual section, dated uniq(1) era, and she ate. no crumbs. go forth and deduplicate responsibly, ily, mwah 🦋💖✨