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I wrote some code a few years back, basically it was channel services for IRC. It has about 96 .c files that are compiled into a single binary. Each file contains copyright info at the top, so rather than edit each file one at a time to modify the copyright each year, I wrote a script to do it for me.
for x in *.c
ed -s $x << end
g/some string/s//to some other string/g
Of course you can modify it to suit your need to edit other type files. The key being each file contains “some string”