uutils/sed

l command uses different escape format than GNU

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#249 opened on Jan 11, 2026

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good first issue

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Description

Rust (incorrect format)

  $ echo "cÃ🧰y" | cargo run --quiet -- -e 'l'
  # Output: c\u00C3\U0001F9F0y$
  # (Uses \uXXXX and \UXXXXXXXX Unicode escape format)
  # Exit code: 0

GNU (correct format)

  $ echo "cÃ🧰y" | /usr/bin/sed -e 'l'
  # Output: c\303\203\360\237\247\260y$
  # (Uses \XXX octal escape format)
  # Exit code: 0

Bug Found by Fuzzer

Contributor guide

Research direction
Inspect the implementation of the 'l' command in the Rust sed rewrite. Locate where Unicode escape sequences are generated for non printable bytes and change them to octal \XXX format to match GNU sed behavior.
Tech stack
rust
Domain
cli
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitRust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75