sum(1)
NAME
sum − print checksum and block count for a file
SYNOPSIS
sum [−r] filename
AVAILABILITY
SUNWesu
DESCRIPTION
sum calculates and prints a 16-bit checksum for the named file, and also prints the number of 512 byte blocks in the file. It is typically used to look for bad spots, or to validate a file communicated over some transmission line.
OPTIONS
−r Use an alternate (machine-dependent) algorithm in computing the checksum.
ENVIRONMENT
If any of the LC_∗ variables (LC_CTYPE, LC_MESSAGES, LC_TIME, LC_COLLATE, LC_NUMERIC, and LC_MONETARY) (see environ(5)) are not set in the environment, the operational behavior of sum for each corresponding locale category is determined by the value of the LANG environment variable. If LC_ALL is set, its contents are used to override both the LANG and the other LC_∗ variables. If none of the above variables is set in the environment, the "C" (U.S. style) locale determines how sum behaves.
LC_CTYPE
Determines how sum handles characters. When LC_CTYPE is set to a valid value, sum can display and handle text and filenames containing valid characters for that locale. sum can display and handle Extended Unix code (EUC) characters where any individual character can be 1, 2, or 3 bytes wide. sum can also handle EUC characters of 1, 2, or more column widths. In the "C" locale, only characters from ISO 8859-1 are valid.
LC_MESSAGES
Determines how diagnostic and informative messages are presented. This includes the language and style of the messages, and the correct form of affirmative and negative responses. In the "C" locale, the messages are presented in the default form found in the program itself (in most cases, U.S. English).
SEE ALSO
DIAGNOSTICS
“Read error” is indistinguishable from end of file on most devices; check the block count.
Sun Microsystems — Last change: 14 Sep 1992