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ANSWER FOR: https://stackoverflow.com/q/4833052/1896134

Answer (Individual Files)

1. Showcase keys to use in selection.

xattr ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
    # com.apple.FinderInfo
    # com.apple.lastuseddate#PS
    # com.apple.metadata:kMDItemIsScreenCapture
    # com.apple.metadata:kMDItemScreenCaptureGlobalRect
    # com.apple.metadata:kMDItemScreenCaptureType

2. Pick a Key to delete.

xattr -d com.apple.lastuseddate#PS ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
xattr -d kMDItemIsScreenCapture ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png

3. Showcase keys again to see they have been removed.

xattr -l ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
    # com.apple.FinderInfo
    # com.apple.metadata:kMDItemScreenCaptureGlobalRect
    # com.apple.metadata:kMDItemScreenCaptureType

4. Lastly, REMOVE ALL keys for a particular file

xattr -c ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png

Answer (All Files In A Directory)

1. Showcase keys to use in selection.

xattr -r ~/Desktop

2. Remove a Specific Key for EVERY FILE in a directory

xattr -rd com.apple.FinderInfo ~/Desktop

3. Remove ALL keys on EVERY FILE in a directory

xattr -rc ~/Desktop

WARN: Once you delete these you DON'T get them back! FAULT ERROR: There is NO UNDO.

Errors

I wanted to address the error's people are getting. Because the errors drove me nuts too... On a mac if you install xattr in python, then your environment may have an issue.

There are two different paths on my mac for xattr

type -a xattr

    # xattr is /usr/local/bin/xattr    # PYTHON Installed Version
    # xattr is /usr/bin/xattr          # Mac OSX Installed Version

So in one of the example's where -c will not work in xargs is because in bash you default to the non-python version.

Works with -c

/usr/bin/xattr -c

Does NOT Work with -c

/usr/local/bin/xattr -c
    # option -c not recognized

My Shell/Terminal defaults to /usr/local/bin/xattr because my $PATH /usr/local/bin: is before /usr/bin: which I believe is the default.

I can prove this because, if you try to uninstall the python xattr you will see:

pip3 uninstall xattr
Uninstalling xattr-0.9.6:
  Would remove:
    /usr/local/bin/xattr
    /usr/local/lib/python3.7/site-packages/xattr-0.9.6.dist-info/*
    /usr/local/lib/python3.7/site-packages/xattr/*
Proceed (y/n)?

Workarounds

To Fix option -c not recognized Errors.

  1. Uninstall any Python xattr you may have: pip3 uninstall xattr
  2. Close all Terminal windows & quit Terminal
  3. Reopen a new Terminal window.
  4. ReRun xattr command and it should now work.

OR

If you want to keep the Python xattr then use

/usr/bin/xattr

for any Shell commands in Terminal

Example:

Python's version of xattr doesn't handle images at all:

Good-Mac:~ JayRizzo$ xattr ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
    # com.apple.FinderInfo
    # Traceback (most recent call last):
    #   File "/usr/local/bin/xattr", line 8, in <module>
    #     sys.exit(main())
    #   File "/usr/local/lib/python3.7/site-packages/xattr/tool.py", line 196, in main
    #     attr_value = attr_value.decode('utf-8')
    # UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb0 in position 2: invalid start byte

Good-Mac:~ JayRizzo$ /usr/bin/xattr ~/Desktop/screenshot\ 2019-10-23\ at\ 010212.png
    # com.apple.FinderInfo
    # com.apple.lastuseddate#PS
    # com.apple.metadata:kMDItemIsScreenCapture
    # com.apple.metadata:kMDItemScreenCaptureGlobalRect
    # com.apple.metadata:kMDItemScreenCaptureType

Man Pages

MAN PAGE for OSX xattr

MAN PAGE for Python xattr VERSION 0.6.4

NOTE: I could not find the python help page for current VERSION 0.9.6

Thanks for Reading!