Security tool · utils
anew
Appends only new, unique lines to a file (and prints them). The one-line dedup that makes pipelines idempotent.
Overview
Where anew fits
Appends only new, unique lines to a file (and prints them). The one-line dedup that makes pipelines idempotent.
Detection-first use
Start with the least intrusive template that can distinguish your hypothesis from a normal response. Preserve raw output and a negative control.
Install
Installation references
Install with goAuthorization required
go install github.com/tomnomnom/anew@latest- Positive signal
- Tool-specific output that supports the stated hypothesis.
- Negative control
- No result, or identical behavior against a known-safe control.
- Intrusiveness
- Review flags and target scope before execution.
Test safely
Command templates
Append uniqueAuthorization required
Populate placeholders only with assets that are explicitly in scope.
cat {input} | anew {output}- Positive signal
- Tool-specific output that supports the stated hypothesis.
- Negative control
- No result, or identical behavior against a known-safe control.
- Intrusiveness
- Review flags and target scope before execution.
Related
Continue the workflow
Sources
Attribution and verification
Version history: normalized permanent page created 2026-08-20. Upstream activity and popularity are separate signals and do not establish tool safety.