[Plug] String Conversion

["Nicolai Rosen" <laktar@hotmail.com>]

I'm trying to create a shell script and I've run into a stumbling block in 
terms of converting one string into another. cut and tr don't seem to be 
able to do what I want. An example of what I want to do is if you had the 
string "foobar" and you wanted to convert every instance of "oba" to "josh", 
but you didn't want to convert the other o to anything. So the desired 
result would be "fojoshr"

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