Install Watch Command on Mac OS X Tutorial and Steps
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If there was one command I would really complain about not running on Mac OS X, it would be “look”. Watch is one of those great pieces of software that is small and completely out of the way, but when needed, it can save your life. We will show you three different ways to install the watch command; via a pre-compiled binary file, with HomeBrew and with MacPorts. Moreover, we will show you something about it how to watch and why it is useful.
What is ‘viewing’ and how does it work?
What is the watch command? For the stranger: it is easy to explain when it comes to watch; Watch will run a command repeatedly and then display the output in an “ncurses” -friendly manner. Another way of explaining this could be to say that you can turn any output from a command line program into a “real-time” screen. A good example is using watch to monitor disk usage.
Now, of course, it is difficult to demonstrate that the command is run repeatedly with a still image, but this could be something you would want to perform when checking the amount of space left on your hard drive while transferring large files. If you look closely at the screenshot, you will see in the top left corner that the command is executed every 5.0 seconds or 5 seconds. The command that will be executed is “df -kh”. The output tells us the disk size, space used, available space and percentage used (capacity) in a human readable format (that’s what the ‘h’ stands for in df -kh). If we delete a lot of the files or copy new files to our computer, we will see these values change. If you wanted to see smaller steps, you would remove the “h” and just run “df -k”.
The basic usage for watch is: watch -n number_of_seconds “command”
So watching is pretty good. Let’s get the watch working on your Mac.
There are a few different ways to install the Watch command in Mac OS X, including with Homebrew, MacPorts, or with a pre-compiled binary file. If you really want it, you can even put together your own watch. We will discuss the three easiest methods to get watch on Mac.
Install Watch in Mac OS X with Homebrew or MacPorts
If you’re using HomeBrew or MacPorts, you can also install watch from these tools:
For Homebrew, install the watch command with:
brew install watch
For MacPortsyou can install a watch with:
sudo port install watch
Both will also install watch on the Mac, use whatever approach you like. With Homebrew or Macports, you can just type ‘watch’ after the installation is complete to run the command.
How to Install and run Watch in OS X with a pre-compiled binary file
As mentioned, we have three choices; install watch as a precompiled binary, install watch with Homebrew, or install Watch with MacPorts. The precompiled binary works if you don’t have homebrew or ports installed in OS X.
Download the precompiled ‘watch’ command from Terminal.appWe use “curl”, a command line “browser”, this downloads watch to your Mac, but if you want you can also use MacPorts or Homebrew to install watch, which are listed below: curl -O http: // ktwit. net / code / watch-0.2-macosx / watch
Make “watch” executableBy doing this we are telling Mac OS that this is a program that can view runchmod + x
Test the programLet’s make sure everything is ok ../ watch
Install “watch”Optional: By following this next step, we will place the watch in a system location that will allow you to run it from anywhere in the terminal (you will be prompted for your password) sudo mv watch / usr / local / bin /
Congratulations, you have added the watch command to your Mac OS X system.
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