Fixing all the license headers in code recursively, changing "FrostWire(TM)" to "FrostWire(R)" in bash

gistfile1.sh

#first find the files that need to be changed, and output their paths to a text file
#I use 'cut', to trim the ":" left by the grep output.
grep "FrostWire(TM)" * -R | awk {'print $1'} | cut -d ":" -f 1 > tm_replace

#then go through each file path in the text file and perform a search and replace using perl regex
for FILE in `cat tm_replace`; do  perl -p -i -e 's/FrostWire\(TM\)/FrostWire\(R\)/g' $FILE; done

You can replace the whole first line (grep command) with grep -l > tm_replace

You could skip it altogether if you don't need to preserve timestamps of files. Just run sed or Perl on all files. They would change only matching files anyway. Otherwise you scan all matching files twice.