SUM(1)                               SysV                               SUM(1)



NAME
     sum - print checksum and block count of a file

SYNOPSIS
     sum [ -r ] file

DESCRIPTION
     sum calculates and prints a 16-bit checksum for the named file, and also
     prints the number of blocks in the file.  It is typically used to look
     for bad spots, or to validate a file communicated over some transmission
     line.  The option -r causes an alternate algorithm to be used in
     computing the checksum.

SEE ALSO
     wc(1).

DIAGNOSTICS
     "Read error" is indistinguishable from end of file on most devices; check
     the block count.