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Annotation of 42BSD/usr.lib/learn/editor/L38.1a, revision 1.1

1.1     ! root        1: #print
        !             2: Sometimes it is desirable to specify that
        !             3: the characters to be changed are at the beginning
        !             4: of the line.  This uses the '^' character.  For example,
        !             5:   s/^ab/xy/p
        !             6: will change "ab" to "xy" ONLY if "ab" begins the line.
        !             7: Remember that 
        !             8:   s/ab/xy/p
        !             9: would just change the first "ab" anywhere in the line.
        !            10: In this directory there is a file "text"; whenever the
        !            11: letters "cat" begin a line, change them to "mouse; but leave
        !            12: other instances of "cat" unaltered.  Do this on each line (it only
        !            13: takes one command, as you know).  Then rewrite the file and
        !            14: type "ready".
        !            15: #create Ref
        !            16: mouse's paw
        !            17: alley cat
        !            18: mouse has nine lives
        !            19: let the cat out of the bag
        !            20: #create text
        !            21: cat's paw
        !            22: alley cat
        !            23: cat has nine lives
        !            24: let the cat out of the bag
        !            25: #user
        !            26: #cmp Ref text
        !            27: #log
        !            28: #next
        !            29: 39.1a 10

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