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9.8 Diffzero

The `diffzero` command zeros the different summary counters used by the `diff` and `diffsummary` commands.

    Syntax  : diffzero = "diffzero"
    Examples: diffzero

The `diffzero` command was added so as to allow regression testing shellscripts to zero their differences counters at the start of a run. This allows testers to invoke the same regression testing script twice in one interactive session without receiving an inflated differences summary.

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