I've downloaded some
.jar files from the internet and want to use them under Mac OS X. But the OS seems to have tagged them with the extended attribute com.apple.quarantine (no indication of this until I noticed the "
@" in the
ls -l and figured out how to use
ls -l@) -- apparently because they have been downloaded from the internet. What's the right way to deal with this?
I've downloaded some
This attribute is added so that it can ask for user confirmation the first time the downloaded program is run, to help stop malware. Upon confirmation the attribute should be removed automatically, and then the program will run normally.
You don't have to deal with it. Open it and OS X will ask for your permission. Or like richard suggested, delete it using something like:
xattr -d com.apple.quarantine my_jar.jar
To do this automatically for any downloaded file you can attach a folder action to the download folder, like described on macosxhints.com in 10.5: Remove the 'downloaded file' warning flag.
And the following was posted on macosxhints.com a long time ago, for Safari: 10.5: Disable the 'downloaded from internet' file warning, claiming one can remove
/Library/Internet Plug-Ins. I did not test that.
As an aside: sometimes one needs to start a single program multiple times on a Mac. That can be done using
cd /Applications/some-application/ followed by
open -n "Application Name.app". This really needs the
.app suffix; running
open -n "Application Name" might get one GateKeeper stopping access:
"Application Name" can't be opened because it is from an unidentified developer.
Your security preferences allow installation of only apps from the Mac App Store and identified developers.
Above, even removing the extended attribute
com.apple.quarantine does not fix that, but using the
.app suffix works just fine.
(I am not advising anyone to actually get rid of the security measures.)
xattr -d com.apple.quarantine /path/to/file
You can disable the warnings permanently with
defaults write com.apple.LaunchServices LSQuarantine -bool false. It also disables the Gatekeeper dialogs even if you haven't allowed applications downloaded from anywhere in System Preferences.
I found the following command
find Application.app | while read l; do echo $l; xattr -d com.apple.quarantine "$l"; done
very helpful when trying to get rid of the attribute. Note the double quotes around
$l – you need them if your apps folder contains files with a blank in their name.
xattr now has a -r flag to recurse. So you don't have to go through that find stuff. Also it has a -c that will clear ALL flags (including FinderInfo), not always recommended unless you're really mad at it. :-)