The codesign command is used to sign apps and check the signature of apps. Apps need to be signed more and more and more these days. So, you might need to loop through your apps and verify that they’re signed. You might also choose to stop trusting given signing authorities if one is compromised. To check signing authorities, you can use codesign -dv --verbose=4 /Applications/Firefox.app/ 2>&1 | sed -n '/Authority/p' The options in the above command: -d is used to display information about the app (as opposed to a -s which would actually sign the app) -v increases the verbosity level (without the v’s we won’t see the signing “Authority”) –verbose=4 indicates the level of verbosity…