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)