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Command collision

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fcorbelli edited this page Sep 28, 2026 · 2 revisions

SHA-1 collisions: rare, but zpaqfranz likes to look anyway.

Quick summary

collision inspects an archive for SHA-1 collisions.

Power user usage

  • No specific switches in the integrated help.
  • To double-check collisions while adding, see a ... -collision in a.

Lo spiegone

Dispatched as command K to collision(true). Background: Voodoo collisions.

Real-world examples

Inspect an archive

zpaqfranz collision z:\kajo.zpaq

TOP suggested read: double quotes

HIGHLY suggested read: how to select file(s) in zpaq(franz)

Quickstarts FreeBSD Linux Mac Windows Hidden gems

Make it yourself TL;DR Target example (click here if in hurry) Compile-time switches Universal Makefile Quicker-and-dirtier

GUI extraction on Windows catpaq

All the commands

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