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  • Strictly speaking, it's an alias, not a file. Here's how to use the AppleScript from the command line: on run argv [newline] tell application "Finder" to set extension hidden of (POSIX file (first item of argv) as alias) to true [newline] end run, use as osascript filename.scpt targetfile. Commented Mar 12, 2012 at 21:45
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    You're right, of course. I added the full AppleScript event. In the future, just go ahead and add anything important to the answer – you're always welcome to. Commented Mar 12, 2012 at 21:50
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    just what I was looking for.. thankfully I have Xcode installed and SetFile did the trick :-) Commented Oct 2, 2013 at 13:42
  • SetFile is deprecated since Xcode 6. Also the link to manual page has expired. Commented Nov 8, 2018 at 5:25
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    SetFile is deprecated as noted, but it's still present on Catalina. Using it worked well enough for me today. Commented Jan 28, 2021 at 9:42