term% cat index.txt SUM(1) General Commands Manual SUM(1)
NAME
sum - sum and count blocks in a file
SYNOPSIS
sum [ file ] ...
DESCRIPTION
Sum calculates and prints a 16-bit checksum along with the length (in
blocks) and name of each file. If no files are given, the standard in‐
put is summed. If file is `-', file names are read from standard in‐
put.
Sum is typically used to look for bad spots, or to validate a file com‐
municated over some transmission line.
SEE ALSO
wc(1).
DIAGNOSTICS
`Read error' is indistinguishable from end of file on most devices;
check the byte count.
SUM(1)