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Annotation of 42BSD/usr.lib/learn/editor/L36.1a, revision 1.1

1.1     ! root        1: #print
        !             2: So far all the special characters in the substitute command
        !             3: have been used in the left-hand expression, the one that
        !             4: is looked for in the line as it exists before the change.
        !             5: None of these characters are meaningful in the right-hand
        !             6: expression; for example,
        !             7:   s/ab/a./
        !             8: turn "ab" into "a." just as if "." were an ordinary letter.
        !             9: But there is one character that is special on the right
        !            10: side of a substitution, which is '&'.  The ampersand
        !            11: is replaced by whatever text is being replaced.  In
        !            12:   s/the/&m/
        !            13: the string "the" is turned into "them" because the '&' is
        !            14: replaced by "the".
        !            15: In this directory there is a file 'text'; on the third line,
        !            16: change the word 'dog' into 'dogs'; then rewrite the file
        !            17: and say "ready".
        !            18: #create Ref
        !            19: cat
        !            20: mouse
        !            21: dogs
        !            22: rat
        !            23: #create text
        !            24: cat
        !            25: mouse
        !            26: dog
        !            27: rat
        !            28: #user
        !            29: #cmp text Ref
        !            30: #log
        !            31: #next
        !            32: 37.1a 10
        !            33: 37.2a 6

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