NAME
cksfv - tests and creates simple file verification (SFV) listings
SYNOPSIS
cksfv [-bciqrL] [-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 checksuming 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 path
Go to the path name directory and verify checksums in the sfv
file
-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.
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>.