I want to go through a bunch of directories and rename all files that end in _test.rb to end in _spec.rb instead. It's something I've never quite figured out how to do with bash so this time I thought I'd put some effort in to get it nailed. I've so far come up short though, my best effort is:
find spec -name "*_test.rb" -exec echo mv {} `echo {} | sed s/test/spec/` \;
NB: there's an extra echo after exec so that the command is printed instead of run while I'm testing it.
When I run it the output for each matched filename is:
mv original original
i.e. the substitution by sed has been lost. What's the trick?