NAME

sum − print checksum and block count of a file

SYNOPSIS

sum [ −r ] [ file ]

DESCRIPTION

Sum calculates and prints a 16-bit checksum for the named file, and also prints the number of blocks in the file.  Stdin is used if no file names are given.  Sum 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. 

DIAGNOSTICS

“Read error” is indistinguishable from end of file on most devices; check the block count. 

SEE ALSO

wc(1). 

Hewlett-Packard Company  —  Version B.1,  May 11, 2021