NAME

sum − print checksum and block count of a file

SYNOPSIS

sum [ −r ] file

DESCRIPTION

The sum command calculates and prints a 16-bit checksum for the named file and 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. 

\*U  —  Version 1.0