32v 1m sum
From Computer History Wiki
SUM(1) UNIX Programmer's Manual SUM(1)
Contents
NAME
sum - sum and count blocks in a file
SYNOPSIS
sum file
DESCRIPTION
_S_u_m 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.
SEE ALSO
wc(1)
DIAGNOSTICS
`Read error' is indistinuishable from end of file on most devices; check the block count.