The tool you want is almost certainly dscl. The shortest way to do it was already pointed out: $ dscl . list /users $ dscl . list /groups If you want to output information about each user, though, use readall: $ dscl . readall /users $ dscl . readall /groups And if you need to … Read more
On OS X 10.10 (and iOS 8.0), you can use [[NSProcessInfo processInfo] operatingSystemVersion] which returns a NSOperatingSystemVersion struct, defined as typedef struct { NSInteger majorVersion; NSInteger minorVersion; NSInteger patchVersion; } NSOperatingSystemVersion; There is also a method in NSProcessInfo that will do the comparison for you: – (BOOL)isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion)version Beware, although documented to be available in OS … Read more