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Annotation of 43BSD/usr.lib/learn/morefiles/L6.1a, revision 1.1

1.1     ! root        1: #print
        !             2: Of course it is still possible to use files with "<" and ">"
        !             3: to supply input to one end of a pipeline and to
        !             4: collect the output from the other end.
        !             5: In this directory are two files whose names begin
        !             6: with "bio".  Collect the last 15 lines of these two files
        !             7: (combined) in a file called "last", then type "ready".
        !             8: #create bio1
        !             9:    Roughly speaking, your eye is made of three balls, or layers,
        !            10: fitted tightly one inside the other.  the tough white outermost
        !            11: layer's function is to protect the others.  the middle layer gives
        !            12: the front of your eye its brown, gray, or blue color.  The inside
        !            13: of this layer is dark and full of tiny blood vessels.  The innermost
        !            14: layer, called the retina, is made of very special nerve cells that
        !            15: are sensitive to light and color.  A nerve cord connects the retina
        !            16: of each eye to your brain.
        !            17:    The front of your eye's two outer layers (the cornea) is clear,
        !            18: or open, to let light enter.
        !            19: #create bio2
        !            20:    We do not know when life began on the earth, and it seems likely
        !            21: that the answer to this question will remain forever hidden from us.
        !            22: What we do know is that it was some 500 million years ago when the
        !            23: plants and animals of early geologic history had reached a stage of
        !            24: development where they produced hard parts capable of being preserved
        !            25: as fossils.
        !            26:    At this distant date there seemingly was no land life; all life
        !            27: was in the sea.  Moreover, there were no vertebrates, or backboned
        !            28: animals, living -- at least none of sufficient complexity that they
        !            29: left hard structures to be preserved in the form of fossils.
        !            30: #user
        !            31: cat bio* | tail -15 >X1
        !            32: #cmp X1 last
        !            33: #log
        !            34: #next
        !            35: 6.1b 10

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