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

1.1     ! root        1: #print
        !             2: Now that you know how to delete lines,
        !             3: you may eventually delete some by mistake.
        !             4: If you just deleted some lines, you can always recover them
        !             5: with the 'u' command.  For example,
        !             6: 
        !             7:   1,5d
        !             8:   u
        !             9: 
        !            10: will delete the first 5 lines and then 'undo' that change.
        !            11: 
        !            12: I will put you in the editor with a file called 'colors'.
        !            13: Print its contents, then delete the first 5 lines
        !            14: and issue the 'undo' command.  Print the
        !            15: file again to make sure that it's all there, rewrite the file,
        !            16: quit, and type 'ready'.
        !            17: #create Ref
        !            18: red
        !            19: yellow
        !            20: blue
        !            21: green
        !            22: purple
        !            23: brown
        !            24: orange
        !            25: #create colors
        !            26: red
        !            27: yellow
        !            28: blue
        !            29: green
        !            30: purple
        !            31: brown
        !            32: orange
        !            33: #copyin
        !            34: #pipe
        !            35: ex +'set prompt noopt open' colors
        !            36: #user
        !            37: #unpipe
        !            38: #uncopyin
        !            39: (diff Ref colors || grep 1,5d .copy) > /dev/null
        !            40: #log
        !            41: #next
        !            42: 20.01b 10

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