Inline searc and replace inside file

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# 1  
Old 10-18-2009
Inline searc and replace inside file

I have a text file that i want to redirect into a new file , searching and replacing certain string during the opertaion.
This should be done using shell script , so it should not be interactive.
The script should get four parameters :
source file
target file
source string
target string

For example :

source file = a.txt
target file = b.txt
source string = apple
target string = banana

Sorce Text file a.txt contain:
Hellow apple

target text file should contain the following result
Hellow banana

# 2  
Old 10-18-2009
What have you attempted so far and where do you get stuck?
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