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12. Invoking cmp

The cmp command compares two files, and if they differ, tells the first byte and line number where they differ. Bytes and lines are numbered starting with 1. The arguments of cmp are as follows:

 
cmp optionsfrom-file [to-file [from-skip [to-skip]]]

The file name ‘-’ is always the standard input. cmp also uses the standard input if one file name is omitted. The from-skip and to-skip operands specify how many bytes to ignore at the start of each file; they are equivalent to the ‘--ignore-initial=from-skip:to-skip’ option.

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


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