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From: Robert Elz <kre@munnari.OZ.AU>
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Subject: Re: Wrong command option in the manual examples
Date: Tue, 24 Sep 2019 00:24:45 +0700
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    Date:        Mon, 23 Sep 2019 10:59:43 -0400
    From:        Greg Wooledge <wooledg@eeg.ccf.org>
    Message-ID:  <20190923145943.GX28751@eeg.ccf.org>

  | But... there literally *is* a real standard for this.

Hmm, yes, you're right.   That suggests that -depth must be a System-V
invention (POSIX wouldn't have added a spec for an undocumented internal
operator from BSD...)

I don't have any System-V (particularly not ancient) sources available
to check - I did verify that -depth is not in System-III though (or at
least is not documented in it.)

kre