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Tool for adding license headers to source files?

I'm looking for a tool that will, in bulk, add a license header to some source files, some of which already have the header. Is there a tool out there that will insert a header, if it is not already present?

Edit: I am intentionally not marking an answer to this question, since answers are basically all environment-specific and subjective

Solution 
  • #!/bin/bash

for i in *.cc # or whatever other pattern...
do
  if ! grep -q Copyright $i
  then
    cat copyright.txt $i >$i.new && mv $i.new $i
  fi
done