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Annotation of 43BSDTahoe/usr.lib/learn/files/L7.3a, revision 1.1

1.1     ! root        1: #print
        !             2: Sometimes ? is too flexible, and you
        !             3: only want to allow a few characters.  For example,
        !             4: you might want to abbreviate
        !             5:   ls memo.ab memo.ac
        !             6: without picking up "memo.ad", "!"memo.ae", and so forth.
        !             7: You can match one of a set of particular characters by 
        !             8: putting them in brackets "[]" in the list you use with "ls".
        !             9: For example,
        !            10:   [bc]
        !            11: matches either b or c but no other letters.
        !            12: Thus the command
        !            13:   ls memo.a[bc]
        !            14: would match "memo.ab", "memo.ac", and nothing else.
        !            15: Try that command in this directory: type a plain
        !            16: "ls" first, and then "ls memo.a[bc]".
        !            17: How many files does "ls memo.a[bc]" match?
        !            18: Type "answer N" where N is the number.
        !            19: #create memo.ab
        !            20: #create memo.abc
        !            21: #create memo.bc
        !            22: #copyin
        !            23: #user
        !            24: #uncopyin
        !            25: #match 1
        !            26: #log
        !            27: #next
        !            28: 7.3b 2

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