NAME

sum − print checksum and size of a file

SYNOPSIS

sum [ file ... ]

DESCRIPTION

Sum calculates and prints a 16-bit checksum for the named file, and also prints the size of the file in 512-byte units.  If no files are named, the standard input is read.  It is typically used to look for bad spots, or to validate a file communicated over some transmission line. 

SEE ALSO

wc(1)

DIAGNOSTICS

‘Read error’ is indistinguishable from end of file on most devices; check the 512-byte unit count. 

7th Edition  —  Revision 1.3 of 15/11/90