Batch file editing in the command line

I have a large number of files that need to be edited. Only one line in each needs to be changed and its the same line in each file. I am new to bash scripting a could use a little help.
How can I change this line from "prefix=/devel/target" to "prefix=/home/usr/devel"?
Thanks.

sed. Search the web for 'sed find and replace' and the first hit should give you full examples.

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    Author:   [email protected]
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