How can I find a specific file in a directory tree?
Solution 1:
find . -name '*.[ch]' -type f
*.[ch] represents all *.h and *.c files, -type f finds regular files.
P.S. You might want to accept answers for your other questions :)
Solution 2:
If you are at the top of the directory tree.
find . -name *.c -print
would find all the .c files located below the current "." directory.
Lot's more help can be find by searching "unix find command".