CLI wildcards
 

Having a hard time finding the answer to this one.

As an example, say I have a directory of document files. They all end in .doc and I wanted to change them all to .txt. What would be the appropriate wildcard arguement to preserve the filenames but change the extension?

You can try this:
I'd read the man page beforehand just to make sure you understand what it'll do... or copy your stuff into a test directory and try it out.

Simply put, "*.doc". However, many Windows types of files have spaces in them, so you need to be careful.

You can't just do: mv *.doc *.txt, as that doesn't make sense. What you want to do is a little shell command like:

for i in *.doc ; do
n=`basename "$i" .doc`
mv "$i" "$n".txt
done

Note that the quote marks are required if your filenames have spaces in them.

I'm sure you can use sed. Unfortunately I am not very good at shell scripting so can't post a script. However, take a look here, there could be an answer for you.

rename is the easiest. Just make certain you use "*.doc" as the last argument, to make certain you get the files with spaces in their names.