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Netstat is a bit esoteric for most Mac users who aren’t network administrators. This often manifests itself as a slow connection to websites, slow downloads, and so on. If a number of errors or collisions are visible, there’s a good possibility that there’s a poor connection that is dropping packets. The right side of the Info screen also shows how many data packets have been sent or received by the interface since the last time the Mac was restarted. Selecting any one of those network interfaces provides a wealth of information, including the hardware address (MAC - Media Access Control address, a unique number assigned to each network interface), the IP address (IPv4), link speed, link status, vendor, and model. For example, my late 2015 iMac shows Ethernet (en0), Wi-Fi (en1), Thunderbolt 1 (en2) and Thunderbolt 13 (en3). Info (see the image in the previous section) provides a drop-down menu that lists each of the network interfaces that are built into your Mac. Let’s look at each of the useful tools in Network Utility and how they can be used in troubleshooting.
#IMAGEOPTIM CLI HOW TO#
Network Utility’s individual components can also be accessed from the Unix command line in Terminal, but that’s “beyond the scope of this course.” Just suffice it to say that if you really want to know the gory details of a command, you can type in “man name-of-command” (i.e., man netstat) and not only find out how to access that tool in Terminal, but all of the many options available. The last way? Just ask Siri - say “Launch Network Utility” and the app is immediately on your screen. The second is even easier click the Spotlight search icon (it looks like a magnifying glass) on the right side of the Mac menu bar, then type in “Network Utility” and press the return key.
#IMAGEOPTIM CLI WINDOWS#
The first is to go to the Apple Menu, select About This Mac…, click on “System Report”, and then select Network Utility from the Windows menu. There are three much easier ways to find Network Utility and launch it without digging around in hidden folders. System/Library/CoreServices/Applications If Network Utility is no longer in the Utilities folder of the Mac, where is it? Looking at the path to the app, it’s hidden away in: Where In The World Is Carmen Sandiego Network Utility? So where is Network Utility hiding these days, and how can it be used to troubleshoot network problems? Apple put all of these useful tools into a single app called Network Utility, which up until 2014 could be found residing in the Application > Utilities folder. Likewise, traceroute was always useful for finding out where in the long chain of bounces between computer, routers and servers that communications between machines was breaking down. Many old-timers wistfully remember the “fun” of typing in a ping command at the command line followed by an IP address, then waiting to see whether there was a response. You can use ImageOptim on Linux servers via a Web Service that also offers image resizing.Back in the early days of the Internet, things weren’t quite as stable as they are now so system administrators created a suite of tools to help troubleshoot issues. It has a grunt-imageoptim wrapper for building with GruntJS. Third-party solutions ImageOptim-CLIįor simpler command-line interface and integration with other tools like ImageAlpha, see ImageOptim-CLI tool. You can specify any number of files or directories as arguments, but you must not specify any flags (arguments must not start with -). The command will block and wait until all files are optimized.Įach execution of this command will start and quit a new, independent ImageOptim instance. This will launch ImageOptim with hidden UI and optimize all *.png files synchronously. The best way to run ImageOptim from bash scripts or build systems (Make, ant): /Applications/ImageOptim.app/Contents/MacOS/ImageOptim *.png open -a ImageOptim *.png will optimize all PNG files in the current directory. argument at the end you can specify any files or directories, e.g. When this command is executed multiple times files will be added to ImageOptim instance that is already running. The command will end immediately and will not wait for the result. This will launch ImageOptim with visible UI and asynchronously optimize all images in the current directory and subdirectories. The easiest way to launch ImageOptim from Terminal: open -a ImageOptim.
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#IMAGEOPTIM CLI DOWNLOAD#
Old Mac? Download for Snow Leopard & Mountain Lion (10.6-10.8).Saves disk space & bandwidth by compressing images without losing quality.