.TH SUM 1 .CT 1 files .SH NAME sum, treesum \- sum and count blocks in a file .SH SYNOPSIS .B sum [ .B -5ri ] [ .I file ... ] .PP .B treesum [ .I file ... ] .SH DESCRIPTION By default, .I sum calculates and prints a 32-bit checksum, a byte count and the name of each .IR file . The checksum is also a function of the input length. If no files are given, the standard input is summed. Other summing algorithms are available. The options are .TP .B -i Read file names from standard input. .TP .B -r Sum with the algorithm of System V's .B "sum -r" and print the length (in 1K blocks) of the input. .TP .B -5 Sum with System V's default algorithm and print the length (in 512-byte blocks) of the input. .PP .I Sum is typically used to look for bad spots, to validate a file communicated over some transmission line or as a quick way to determine if two files might be the same. .PP .I Treesum is similar to .BR "sum -r" , except that if .I file is a directory, then .I treesum recursively descends it, summing all non-directories encountered. If no files are given, .IR treesum recursively sums the current directory. .SH "SEE ALSO" .IR wc (1)