Rename all files in directory from $filename_h to $filename_half?

Question

Dead simple.

How do I rename

05_h.png
06_h.png

to

05_half.png
06_half.png

At least, I think it\

Answer 1

for i in *_h.png ; do
  mv $i `echo "$i"|awk -F'.' '{print $1"alf."$2}'`
done