sum

 

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NAME
      sum - print checksum and block count for a file
 

SYNOPSIS
      sum [ -r ]  [ file ... ]
 

DESCRIPTION
      The  sum utility calculates and prints a 16-bit checksum for
      the  named  file  and  the  number of 512-byte blocks in the
      file. It is typically used to look  for  bad  spots,  or  to
      validate a file communicated over some transmission line.
 

OPTIONS
      The following options are supported:
 
      -r    Use an alternate (machine-dependent) algorithm in com-
            puting the checksum.
 

OPERANDS
      The following operands are supported:
 
      file  A path name of a file.  If no  files  are  named,  the
            standard input is used.
 
 
USAGE
      See largefile(5) for the description of the behavior of  sum
      when encountering files greater than or equal to 2 Gbyte ( 2
     **31 bytes).
 
 
ENVIRONMENT VARIABLES
      See environ(5) for descriptions of the following environment
      variables  that  affect  the  execution  of   sum: LC_CTYPE,
      LC_MESSAGES, and  NLSPATH.
 
 
EXIT STATUS
      The following exit values are returned.
 
      0     Successful completion.
 
      >0    An error occurred.
 

ATTRIBUTES
      See attributes(5) for descriptions of the  following  attributes:
 
      ____________________________________________________________
     |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
     | Availability                | SUNWesu                     |
     | CSI                         | enabled                     |
     |_____________________________|_____________________________|
 
 

SEE ALSO
      cksum(1), sum(1B), wc(1), attributes(5), environ(5),  large-
      file(5)
 
DIAGNOSTICS
      "Read error" is indistinguishable from end of file  on  most
      devices; check the block count.
 
NOTES
      Portable applications should use cksum(1).
 
      sum and usr/ucb/sum (see sum(1B))  return  different  check-
      sums.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 SunOS 5.8            Last change: 7 Nov 1995                    2
 
 
 

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