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Get the BSD device name of the network interface

I am trying to find any default tool in OS X by which you can see in Terminal the encodinf of a pdf file. You can do this visually by clicking info on the file. For instance, such files which have Mac OS X 10.10.2 Quartz PDFContext I want to get out of my System. Mac Tools since 1938. Mac Tools was founded in the USA in 1938 with the goal of manufacturing the finest tools in the world. This same spirit has made Mac Tools a world leader in the automotive tool and equipment business today.

1. Log in to your Mac with an administrator account.
2. While holding down the Option key, then choose Apple menu () > System Information (or System Profiler).
3. Select Network from the list on the left side of the System Information window.
4. Select the network interface (such as Wi-Fi or Ethernet) from the list of active services on the right side of the window.
5. From the details section at the bottom of the window, find 'BSD Device Name.' In the example pictured, the BSD device name for Wi-Fi is en0.

Capture the packet trace

1. Open Terminal, which is in the Utilities folder of your Applications folder,.
2. Type the following command, but replace BSDname with the BSD device name (such as en0, en1, or ppp0) from System Information:
   sudo tcpdump -i BSDname -s 0 -B 524288 -w ~/Desktop/DumpFile01.pcap
   
3. Press Return, then enter your administrator password when prompted.
4. Terminal should say tcpdump: listening on.. to indicate that it's listening for activity on that network interface.
5. While Terminal is open, perform the network function that you want to test.
6. When the network function is complete, return to Terminal and press Control-C to capture the packet trace. Terminal saves it to your desktop in a file named 'DumpFile01.pcap.'
7. To see the contents of the file, use this command in Terminal:
   tcpdump -s 0 -n -e -x -vvv -r ~/Desktop/DumpFile01.pcap
   
8. To capture additional packet traces, modify the Terminal command to increment the number of the saved file (such as DumpFile02.pcap and DumpFile03.pcap).

Learn more

The Apple Developer website has more information about packet traces. When troubleshooting a network connection, you should know your computer's model, macOS version, IP address (and the destination IP address), and media access control (MAC) address. You should also understand your computer's role in the network activity, as well as the time of each network event associated with the issue.

When troubleshooting the connection between an AirPort Base Station and a broadband modem, restart the base station and capture its interactions with the Internet service provider while it starts up. You can restart the base station using AirPort Utility, or by briefly unplugging it from power. While testing, it's best if the base station, modem, and capturing computer are connected to an Ethernet hub, not a switch. You should also manually assign the capturing computer's IP address so that it doesn't take the DHCP lease that the base station needs (a 169.254.x.x address should suffice). Free tool for recording screen with audio for mac.

The packet trace may show that the TCP checksum of packets sent by the Mac is bad. This is because the packet trace is being captured at the link layer of the network stack, which is just before the physical network adapter where checksums are generated. This can be safely ignored.

VLC media player is the universal tool that handles all types of media files. I have tried to play some videos on my mac but the format was not compatible with default quick time player.

How do I uninstall Java on my Mac?

This article applies to:

• Platform(s): macOS

Uninstall Oracle Java using the Terminal

Note: To uninstall Java, you must have Administrator privileges and execute the remove command either as root or by using the sudo tool.

Remove one directory and one file (a symlink), as follows:

1. Click on the Finder icon located in your dock
2. Click on Go in the Finder menu
3. Click on Utilities
4. Double-click on the Terminal icon
5. In the Terminal window Copy and Paste the commands below:
   sudo rm -fr /Library/Internet Plug-Ins/JavaAppletPlugin.plugin
sudo rm -fr /Library/PreferencePanes/JavaControlPanel.prefPane
sudo rm -fr ~/Library/Application Support/Oracle/Java

Do not attempt to uninstall Java by removing the Java tools from /usr/bin. This directory is part of the system software and any changes will be reset by Apple the next time you perform an update of the OS.
Note: After successfully uninstalling Java, you may remove Java Deployment cache using these instructions.

Can I restore Apple Java 6 after uninstalling Oracle Java?

Yes, see the instructions on the Apple website Restore Apple Java 6. If you have JDK 7 or later versions installed on your system and you want to restore Apple Java 6, then those JDK versions need to be uninstalled first. See the instructions to Uninstall JDK.

MORE TECHNICAL INFORMATION

Uninstall JDK

Mac Tools Terminal Release Tool

To uninstall JDK 7 and later versions, you must have Administrator privileges and execute the remove command either as root or by using sudo. See the instructions to Uninstall JDK.

You might also be interested in:

Mac Tools Online Catalog

• Mac OS X information for installing and using Java
• How do I install Java for my Mac?
• Where is the Java Control Panel on Mac?
• How do I clear Java cache on my Mac?
• How do I Update Java for my Mac?

Terminal Tool For Wire Removal