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create and verify md5 checksum lists from directory trees or single files, to verify downloads or to seal your backup dvds under windows and linux.

- download the free swiss file knife base from sourceforge.
- unpack the tool using winzip or unzip.
- open the Windows Command Line or a Linux shell.

sfk md5gento=outfile dir [mask] [mask2] [!mask3] [...]
sfk md5gento=outfile -dir dir1 dir2 -file mask1 mask2 !mask3 [...]
    create list of md5 checksums over all files in a folder.
    by default, this also includes all subfolders (recursive tree walk).
       sfk md5gento=md5.dat thedir

sfk md5check=infile [-skip=n] [-skip n]
    verify list of md5 checksums. to speed up verifys by spot checking,
    specify -skip=n: after every checked file, n files will be skipped.
       sfk md5check=md5.dat

sfk md5 [-quiet] [-verify md5sum] file1 [file2 file3 ...]
   calculate md5 hash of one or more files, and optionally compare the results.
   if md5 sums are compared, both a message is issued, and the shell return code
   is set to 0 (all equal) or 1 (not equal).

      sfk md5 test01.dat
         tell md5 sum of test01.dat

      sfk md5 test01.dat test02.dat
         compare both files, if content is the same.

      sfk md5 -quiet -verify 14da96b20e45fd84c46c5b7aef641cb3 test01.dat
         check if test01.dat has an md5 matching the one specified.
         issues no output, returns a shell return code > 0 on mismatch.


If you're storing backups on DVD or USB stick, you may turn them into
self-verifying archives by adding an md5 list, sfk.exe, and a short
batch file in it's root directory. For example, create a batch file
"90verify.bat" that contains two commands:

      91tools\sfk md5check 91tools\md5sum.txt
      pause

Then create a directory 91tools, copy sfk.exe into it, and run

   sfk md5gento=91tools\md5sum.txt .

Test the whole stuff once before burning, by running 90verify.bat.
Then burn everything onto DVD. Insert the DVD into another PC, 
double-click on 90verify.bat. This way you verify that your DVD 
can be read also on another machine, which is an important test 
for your data's safety.

The md5 checksums for the current sfk distribution binaries are:
 
sfk157.zip         2069173c77c372a637d6781155e716e4
sfk.exe            cd4f8c50611bc53708682a7a2844d603
sfk-linux.exe      90282cd3807f0a45d826861e3b8304e1
sfk-linux-lib5.exe e9425da281953d2263003257f5bfa6af

read more about all sfk functions here.

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