sum(1)
Name
sum − print object file’s checksum
Syntax
sum file...
Description
The sum command 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.
Diagnostics
‘Read error’ is indistinguishable from end of file on most devices; check the block count.