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Annotation of 42BSD/usr.lib/learn/editor/L20.01b, revision 1.1

1.1     ! root        1: #print
        !             2: The undo command actually "undoes" the effects of the
        !             3: last command that changed something.
        !             4: So, though it is often used to recover deleted lines,
        !             5: it can also be used to remove lines you just appended.
        !             6: But if you decide that you really did want some lines
        !             7: that you appended and then removed with 'u',
        !             8: you can always issue another 'u' to get them back.
        !             9: The second 'u' undoes the first 'u', and a third 'u' would
        !            10: remove them again, etc.  Thus 'u' is its own inverse.
        !            11: 
        !            12: I will now put you in the editor with 'colors'.  Append the lines
        !            13: 
        !            14: grey
        !            15: violet
        !            16: 
        !            17: at the end.  Then undo the append once, print the file,
        !            18: and then undo the first undo.
        !            19: When your're done, rewrite the file, quit, and type 'ready'.
        !            20: #create Ref
        !            21: red
        !            22: yellow
        !            23: blue
        !            24: green
        !            25: purple
        !            26: brown
        !            27: orange
        !            28: grey
        !            29: violet
        !            30: #create colors
        !            31: red
        !            32: yellow
        !            33: blue
        !            34: green
        !            35: purple
        !            36: brown
        !            37: orange
        !            38: #copyin
        !            39: #pipe
        !            40: ex +'set prompt noopt open' colors
        !            41: #user
        !            42: #unpipe
        !            43: #uncopyin
        !            44: (diff Ref colors || grep '^u' .copy) > /dev/null
        !            45: #log
        !            46: #next
        !            47: 20.01c 10

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