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

by

Just use bash, no need to call external commands.

for file in *_h.png
do
  mv "$file" "${file/_h.png/_half.png}"
done

Do not add #!/bin/sh

For those that need that one-liner:

for file in *.png; do mv "$file" "${file/_h.png/_half.png}"; done

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