NAME

sum − calculate a checksum for a file

SYNOPSIS

/usr/ucb/sum filename

DESCRIPTION

sum calculates and displays a 16-bit checksum for the named file, and also displays the size of the file in kilobytes.  It is typically used to look for bad spots, or to validate a file communicated over some transmission line.  The checksum is calculated by an algorithm which may yield different results on machines with 16-bit ints and machines with 32-bit ints, so it cannot always be used to validate that a file has been transferred between machines with different-sized ints. 

SEE ALSO

sum(1), wc(1). 

DIAGNOSTICS

Read error is indistinguishable from EOF on most devices; check the block count. 

NOTES

Obsolescent. 

  —  BSD Compatibility Package