On a Mac OS X system, you can check on the status of a wifi connection using the wifi icon at the top of the screen. If you wish to check the status of a wifi connection from the command line, you can use the
networksetuputility provided with the operating system. The command has a lot of options suitable for viewing the status of a wifi connection and managing wireless connectivity. You can view the available wireless networks, switch from one wireless network to another, power the wireless connection on and off, etc. using options supported by the command.
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