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Invoking cmp

The cmp command compares two files, and if they differ, tells the first byte and line number where they differ.

Its arguments are: cmp options ... from-file [ to-file].

The file name '-' is always the standard input. cmp also uses the standard input if one file name is omitted.

An exit status of 0 means no differences were found, 1 means some differences were found, and 2 means trouble.

See also Options to cmp.