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shasum (1)
  • >> shasum (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
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    NAME

    shasum - Print or Check SHA Checksums
     
    

    SYNOPSIS

     Usage: shasum [OPTION] [FILE]...
        or: shasum [OPTION] --check [FILE]
     Print or check SHA checksums.
     With no FILE, or when FILE is -, read standard input.
    
    

      -a, --algorithm    1 (default), 224, 256, 384, 512
      -b, --binary       read files in binary mode (default on DOS/Windows)
      -c, --check        check SHA sums against given list
      -p, --portable     read files in portable mode
                             produces same digest on Windows/Unix/Mac
      -t, --text         read files in text mode (default)
    
    

     The following two options are useful only when verifying checksums:
    
    

      -s, --status       don't output anything, status code shows success
      -w, --warn         warn about improperly formatted SHA checksum lines
    
    

      -h, --help         display this help and exit
      -v, --version      output version information and exit
    
    

     The sums are computed as described in FIPS PUB 180-2.  When checking,
     the input should be a former output of this program.  The default mode
     is to print a line with checksum, a character indicating type (`*'
     for binary, `?' for portable, ` ' for text), and name for each FILE.
    
    
     

    DESCRIPTION

    The shasum script provides the easiest and most convenient way to compute SHA message digests. Rather than writing a program, the user simply feeds data to the script via the command line, and waits for the results to be printed on standard output. Data can be fed to shasum through files, standard input, or both.

    The following command shows how easy it is to compute digests for typical inputs such as the NIST test vector ``abc'':

            perl -e "print qw(abc)" | shasum
    
    

    Or, if you want to use SHA-256 instead of the default SHA-1, simply say:

            perl -e "print qw(abc)" | shasum -a 256
    
    

    Since shasum uses the same interface employed by the familiar sha1sum program (and its somewhat outmoded anscestor md5sum), you can install this script as a convenient drop-in replacement.  

    AUTHOR

    Copyright (c) 2003-2007 Mark Shelor <mshelor@cpan.org>.  

    SEE ALSO

    shasum is implemented using the Perl module Digest::SHA or Digest::SHA::PurePerl.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    AUTHOR
    SEE ALSO


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