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If stat (or equivalent) is available, you could test the result of e.g. stat -c%F CA
symbolic link

You can make a here-document parse variables literally by beginning it with <<"EOF" instead of <<EOF.

Merry Christmas to All. Peace on Earth and Goodwill toward Everyone

https://www.unix.com/members/1-albums112-picture653.jpg

You can use anbu23's suggestion as a starting point, with some minor changes since the names you want aren't stored in a file and since you don't want the numbers in the new names to start at 00001. ...