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substitute using directory name

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From:
brian54321uk
Date:
September 3, 2008 06:56
Subject:
substitute using directory name
Hi
I would like to replace a string of characters in a file to the name of 
the directory it is in.
Thefore, in the example below, I would like to know how to replace "?"


open( F, $ARGV[0] );

while( <F> ) {

  s!abc123!?!;

  s!xyz123!123xyz!;


{

   print;

  }

}


Any help much appreciated.
Brian
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