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calculate crc32 on the command-line using 7z.exe – Using 7-zip hashing to compare directories and files – Sami Lehtinen

Posted by jpluimers on 2018/02/26

Searching 7z.exe calculate crc32 didn’t return any meaningful results, but [WayBackUsing 7-zip hashing to compare directories and files – Sami Lehtinen did help me as I never noticed that somewhere along the line the h command got added to 7z.exe. It’s not even in the documentation, as found by searching for 7zip commandline arguments:

but it is in the command-line help, at least in versions 16.x:

C:\temp>"C:\Program Files\7-Zip\7z.exe" --help

7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21

Usage: 7z  [...]  [...]

  a : Add files to archive
  b : Benchmark
  d : Delete files from archive
  e : Extract files from archive (without using directory names)
  h : Calculate hash values for files
  i : Show information about supported formats
  l : List contents of archive
  rn : Rename files in archive
  t : Test integrity of archive
  u : Update files to archive
  x : eXtract files with full paths


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