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       cksfv - tests and creates simple file verification (SFV) listings


       cksfv [-bciqrL] [-C dir] [-f file] [-g path] [file ...]


       cksfv is a tool for verifying CRC32 checksums of files. CRC32 checksums
       are used to verify that files  are  not  corrupted.  The  algorithm  is
       cryptographically crippled so it can not be used for security purposes.
       md5sum (1) or sha1sum (1) are much better tools for checksuming  files.
       cksfv should only be used for compatibility with other systems.

       cksfv   has   two  operation  modes:  checksum  creation  and  checksum

       In checksum creation mode cksfv outputs CRC32 checksums of files to  to
       stdout, normally redirected to an .sfv file.

       In  checksum verification mode  cksfv reads filenames from an sfv file,
       and compares the recorded checksum values against recomputed  checksums
       of files.


       These options are available

       -b     Strip  dirnames  from  filenames  that are checksumed. loads the
              files from original positions,  but  prints  only  basenames  to
              catalogue in sfv file.

       -c     Use  stdout for printing progress and final resolution (files OK
              or some errors detected). This is useful for  external  programs
              analysing  output  of  cksfv.  This  also forces fflushes on the
              output when needed.

       -C dir  Change current directory before proceeding with a  verification
              operation.   This  option  is  mostly  obsoleted with -g option.
              Earlier this  was  used  to  verify  checksums  in  a  different
              directory: cksfv -C foo -f foo/bar.sfv

       -f file
              Verify checksums in the sfv file

       -g path
              Go  to  the  path name directory and verify checksums in the sfv

       -i     Ignore  case  in  filenames.  This  is  used  in  the   checksum
              verification mode.

       -L     Follow  symlinks  when  recursing subdirectories. This option is
              used with the -r option.

       -q     Enable QUIET mode (instead of verbose mode), only error messages
              are printed

       -v     Enable VERBOSE mode, this is the default mode

       -r     recurse  directories  and check the .sfv files in each. Symlinks
              are not followed by default. This option cannot be used with  -f
              and -g options.


       Verify checksums of files listed in ’foo/files.sfv’:
       cksfv -g foo/files.sfv

       Create checksums for a set of files:
       cksfv *.gz > files.sfv

       Verify checksums of case-insensitive filenames listed in ’files.sfv’.
       This is sometimes useful with files created by operating systems
       that have case-insensitive filesystem names.
       cksfv -i -g files.sfv

       Check checksums of files ’foo’ and ’bar’ listed in ’files.sfv’:
       cksfv -g files.sfv foo bar

       Create checksums of files matching /foo/bar/* and strip dirnames away:
       cksfv -b /foo/bar/* > files.sfv

       Recursively scan /foo/bar and verify each .sfv file:
       cksfv -C /foo/bar -r

       Same as previous, but starting from the current working directory
       and also following symlinks during recursion:
       cksfv -r -L


       basename(1) dirname(1) md5sum(1) sha1sum(1)


       This   manual   page   was  originally  written  by  Stefan  Alfredsson
       <>.   It  was  later  modified  by  Heikki  Orsila
       <> and Durk van Veen <>.