> -----Original Message-----
> From: senrong [mailto:[EMAIL PROTECTED]]
> Sent: Monday, March 04, 2002 9:27 AM
> To: [EMAIL PROTECTED]
> Subject: Simple question need ans
> 
> 
> I am writing a simple program that update and search a text 
> file for names and telephone number....
> 
> I just want to change the number in the text file of a 
> person....How do I do it?
> 

There's a FAQ article that addresses this topic:

   perldoc -q 'change one line'

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