Batch rename files with Mac Bash,while the dir index should be recorded

Question

I need to batch rename images with Mac Bash,while the directory index should be recorded.

To rename files ,turn

Root---A----0.png
| |
| ----1.png
|
-------B----0.png
 |
 ----1.png

to

Root---A----0_0.png
| |
| ----0_1.png
|
-------B----1_0.png
 |
 ----1_1.png

Here is my code, it is ok to deal with the situation that dir A has a name of spacing.

Base=$(pwd)
num=0
IFS='
' # split on newline only
for path in *
 do
 if [[ -d $path ]]; then
 NewPath="${Base}/${path}"
 for f in "$NewPath"/* 
 do
 dir=`dirname "$f"`
 base=`basename "$f"`
 name="${dir}/${num}_${base}"
 mv ${f} "$name"
 done 
 num=$((num + 1))
 fi
done

Any way to do it more brilliantly? find is a good option to handle files recursively.

Answer 1

Limit globbing to directories only by appending a slash: for dir in */

If you cd into subdirectories, you don't need to construct a new path for each file. If you cd inside a subshell with ( cd ... ), the original directory will be restored when subshell exits. Make sure to increment n outside of the subshell, or the new value will be lost!

The IFS= is not needed; bash will split the filenames properly. You just need to quote the variable when you refer to it.

n=0
for d in */ ; do
 ( cd "$d" && for f in * ; do mv "$f" $n"_$f" ; done )
 (( n++ ))
done