Update Description Metadata

[openskies2009]

I am trying to point Exiftool to a directory and sub-dir and change all the picture's metadata description to "Not Set". I am following https://exiftool.org/forum/index.php?topic=7935.0 and https://medium.com/@geneparcellano/batch-adjust-exif-time-stamp-using-exiftool-on-mac-a970a67dae2f

But cant get this to work

[StarGeek]

It's helpful if you let us know what you tried, as "cant get this to work" doesn't impart any information.

But taking your post at face value, use this command on a test file to see if it works:
exiftool -description="Not Set" TestFile.jpg

[openskies2009]

That's exactly what I need, but I need it to scan all of the directories and current for images. Not just one file. Ive tried the flag -r but get no such file found

cd /Users/media/Desktop/tool

  exiftool "-description=Not set" -r tool
File not found: "-description=Not
File not found: set"
File not found: tool
    0 image files read
    3 files could not be read

[StarGeek]

  exiftool "-description=Not set" -r tool

Don't use fancy quotes.  Use regular quotes ".

Don't use a word processor or something similar (Google Docs) to copy/paste command from.  They will "fix" your quotes for you automatically unless you change settings.

Also, once you CD into the directory you want to process, use a dot . to represent the current directory.

So try
exiftool "-description=Not set" -r .

[openskies2009]

OK, great! Works! Now is there a way to only process image files?

[StarGeek]

To process only jpegs, add -ext jpg.  To add other file types, add -ext with the extension of that file.