NAME

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

SYNOPSIS

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

DESCRIPTION

       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
       checksumming files. cksfv should only be used for compatibility with other systems.

       cksfv has two operation modes: checksum creation and checksum verification

       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.

OPTIONS

       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 file
              Change  current  directory to the path name of the file 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 can be used with the  -r
              and -R options.

       -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.

       -R     recurse directories and read checksum for each file. Symlinks are not  followed  by
              default.

EXAMPLES

       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

SEE ALSO

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

AUTHOR

       This  manual page was originally written by Stefan Alfredsson <stefan@alfredsson.org>.  It
       was  later  modified  by  Heikki  Orsila  <heikki.orsila@iki.fi>   and   Durk   van   Veen
       <durk.van.veen@gmail.com>.

                                                                                         CKSFV(1)