sum calculates and prints a checksum for the named file, and also prints the space used by the file, in 512-byte blocks. The output is written to standard output.
sum may be useful for checking that a file has arrived complete and unchanged after a file transfer.
Syntax
sum[ -r][ datei]... |
Uses an alternate algorithm to compute the checksum and prints a different checksum.
Name of the file whose checksum is to be calculated. Both ordinary files and directories may be specified. You may name more than one file. file not specified: Caution! |
Locale
The following environment variables affect the execution of sum: LANG Provide a default value for the internationalization variables that are unset or null. If LANG is unset of null, the corresponding value from the implementation-specific default locale will be used. If any of the internationalization variables contains an invalid setting, the utility will behave as if none of the variables had been defined. LC_ALL If set to a non-empty string value, override the values of all the other internationalization variables. LC_CTYPE Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single- as opposed to multi-byte characters in arguments and input files), the classification of characters as upper- to lower-case, and the mapping of characters from one case to the other. LC_MESSAGES Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error. NLSPATH Determine the location of message catalogs for the processing of LC_MESSAGES. |
Example 1
Checksum of the file months using the first algorithm:
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Example 2
Checksum of the file months using the second algorithm:
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See also
cksum, wc |