NAME

sum − sum and count blocks in a file

SYNOPSIS

sum file

DESCRIPTION

Sum calculates and prints a 16-bit checksum for the named file, and also prints the number of blocks in the file, to the nearest whole block.  It is typically used to look for bad spots, or to validate a file communicated over some transmission line. 

EXAMPLE

sum sum.1

produces the checksum and the block count of this manual section, namely:

21009    1

SEE ALSO

wc(1)

DIAGNOSTICS

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

7th Edition  —  1/22/82