Trying to read xattr values on multiple files

Question

In trying to read all the values of the extended attributes on a single file, if I do

xattr -l <filename> | while read ATTR; do
  xattr -p $ATTR <filename>
done

I get what I expect.  But if I try to do multiple files with

for FILE in *; do
  echo "=== $FILE ==="
  xattr -l $FILE | while read ATTR; do
    xattr -p $ATTR $FILE
  done
done

for some files I get only the filename (no xattr, I suppose);
for some files I get

=== 154128428159.JPEG ===
xattr: [Errno 22] Invalid argument: '154128428159.JPEG'
xattr: 154128428159.JPEG: No such xattr: com.apple.macl: 
xattr: [Errno 22] Invalid argument: '154128428159.JPEG'
Not enough arguments for option -p. Expected at least 2 but got 1

and for other files,

xattr: [Errno 22] Invalid argument: 'record-image_-7.jpg'
xattr: record-image_-7.jpg: No such xattr: com.apple.macl: 
xattr: [Errno 63] File name too long: 'record-image_-7.jpg'

I tried putting unset ATTR or ATTR="" in the outer loop, but got the same results.

This is with either zsh or bash on macOS 13.5.2

Answer 1

The man page format confused me and when Gairfowl explained that -l gives the values, I tested it with no options but (oops) the file I tested it on had no attributes.

So actually, I do need a loop, but it’s

for ATTR in $(xattr "$FILE"); do
  xattr -pl $ATTR "$FILE"
done