SUM(1) UNIX Programmer's Manual SUM(1) NNAAMMEE sum - sum and count blocks in a file SSYYNNOOPPSSIISS ssuumm file DDEESSCCRRIIPPTTIIOONN _S_u_m 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. SSEEEE AALLSSOO wc(1) DDIIAAGGNNOOSSTTIICCSS `Read error' is indistinguishable from end of file on most devices; check the block count. Printed 7/27/90 1Q 1