sum(1)                                                               sum(1)

NAME
     sum - print checksum and block count of a file

SYNOPSIS
     sum[ -r][ --][ file]...

DESCRIPTION
     sum calculates and prints a checksum for the named file or directory,
     and also prints the space used by the file, in 512-byte blocks. The
     output is written to standard output. sum counts the contents of all
     bytes together for calculating the checksum.

     sum may be useful for checking that a file has arrived complete and
     unchanged after a file transfer.

OPTIONS
     -r   Uses an alternate algorithm to compute the checksum and prints a
          different checksum. When the checksum is being calculated, the
          sum is shifted 1 bit to the right before the next byte is added.

     --   End of the list of options. Must be specified if file begins with
          -.

     file Name of the file whose checksum is to be calculated. Both ordi-
          nary files and directories may be specified. You may name more
          than one file.

          file not specified:

          sum reads from standard input.

     Caution:
          The algorithms used in computing the checksum may not be port-
          able. Different checksums may thus be produced for the same file
          when sum is run on different systems.

LOCALE
     The LCMESSAGES environment variable governs the language in which
     message texts are displayed. If LCMESSAGES is undefined or is defined
     as the null string, it defaults to the value of LANG. If LANG is like-
     wise undefined or null, the system acts as if it were not internation-
     alized.

     The LCALL environment variable governs the entire locale. LCALL
     takes precedence over all the other environment variables which affect
     internationalization.









Page 1                       Reliant UNIX 5.44                Printed 11/98

sum(1)                                                               sum(1)

EXAMPLES
     Example 1

     Checksum of the file months using the first algorithm:

     $ sum months
     6658 1 months

     Example 2

     Checksum of the file months using the second algorithm:

     $ sum -r months
     62412     1 months

NOTES
     The following error message is displayed if file is the mount point
     for an NFS file system:

          sum: Read error on file: is a directory

SEE ALSO
     cksum(1), wc(1).































Page 2                       Reliant UNIX 5.44                Printed 11/98