Multiple find exec options: synology index command line - unix

Question

I want to index some files on my NAS after moving them in the correct folder.
My command would be something like :
find *.$ext -exec mv "{}" $path \; -exec synoindex -a $(echo $path)$(basename "{}") \;
The first part is working. All files with $ext extension are moved to destination $path.
But the second part, which is supposed to index these files in their new $path folder, does not work.
This is strange because :
{} contains the right value => the complete old path of each file processed
To make sure of that, I added a third part which only does : -exec echo {} \;
Executing separately $(echo $path)$(basename "{}") works, after replacing {} by one real
value taken for example => gives the the complete new path => syntax is correct
Executing separately synoindex -a $(echo $path)$(basename "{}") works, after replacing {} by
one real value taken for example => command is correct
Thanks for any idea.
Regards,

Answer 1

Your command substitutions $(echo $path) and $(basename "{}") are executed by your shell before find is executed.
And you don't need to echo the $path variable. You could execute a small shell script instead:
find . -type f -name "*.$ext" -exec sh -c '
targetpath=$1; shift # get the value of $path
for file; do
mv -i "$file" "$targetpath"
synoindex -a "$targetpath/${file##*/}"
done
' sh "$path" {} +
This starts find in the current directory . searching for regular files (-type f) ending with
the file extension $ext (-name "*.$ext")
and executes a small shell script passing the $path variable as first argument to the script.
The following arguments are the filepaths found by find.
The parameter expansion ${file##*/} removes the longest prefix */ from the file and the result is the basename.
If your $path variable already contains a trailing slash /, then omit the / after $targetpath.