It turns out that Contacts on the Mac stores extra invisible characters with every phone number, which can cause trouble when copying and pasting them into some online forms. Here’s what’s going on and how to work around the problem.

If you’d like to enhance your command-line skills—either for your personal edification or to support your career as a Mac admin—you won’t go wrong by picking one of two books: the recently updated "Take Control of the Mac Command Line with Terminal" or the new "macOS Terminal and Shell."

BitBar is an open-source menu bar app with a rich library of plug-ins that are easy to adapt to your needs. Don’t see what you want? You can even create your own plug-ins!

One of the big changes in macOS 10.15 Catalina is that Apple has replaced the default bash shell in Terminal with zsh, a move that is sure to cause headaches for system administrators. Josh Centers offers some resources to help you adapt to the change.

Video conference systems Zoom and RingCentral have major vulnerabilities that could trigger your Web cam without permission. Here’s how to patch it yourself.

Have you forgotten your Mac’s admin password, or need to help a friend or client who has lost it? Here’s how to reset it, but beware that doing so prevents access to the account keychain’s collection of login credentials.

Recovering a user’s forgotten password used to require special tools or creative administrative management. It’s fairly easy in recent versions of Mac OS X, but many of us still have or need to help people with older operating systems. Here are all the different ways to get back into a Mac if you’re locked out, no matter what version of Mac OS X it’s running.