If your Mac is suddenly suffering hardware or software issues, or is generally acting up you can run sysdiagnosein Mac OS X Terminal. Sysdiagnose compiles a number of advanced technical reports for expert Mac users to review and troubleshoot appropriately. Sysdiagnose will output the following information in a tar.gz file.

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• Crash report
• Input/Output details
• Disk information
• Compiled system profiler report
• System logs (including kernel logs)
• Filesystem usage report
• Memory usage and processes details
• Powermetrics

In reality, Sysdiagnose is ran and performed by Mac OS X technical specialists including Apple store engineers (Genius Bar) and authorized Mac repair shops. The sysdiagnose report is run on Mac X systems as a last or first resort to solving and understanding complex technical hardware and software issues.

Get Started Running Sysdiagnose in Terminal

• Use Mac’s Safe Boot Option. One of the easiest and most straightforward methods to diagnose.
• Choose Software Update from the Apple menu to update Apple software and anything downloaded from the Mac App Store; for anything else, use the app’s built-in software update feature or download the.

1. Open Terminal (Applications -> Utilities -> Terminal)

2. Type the following command in Terminal. Be prepared to wait about 2 to 5 minutes for Sysdiagnose to completely run.

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You will receive the following warning prompt:

This tool generates files that allow Apple to investigate issues with your

computer and help improve Apple products. The files might contain personal

information found on your device or associated with your iCloud accounts and/or

AppleID, including but not limited to your name, your user name, your email address

and email settings, file paths, file names, downloads, your computer’s IP addresses,

and network connection information.

This information is used by Apple in accordance with its privacy policy

(www.apple.com/privacy) and is not shared with any other company. By using

this tool and sending the results to Apple, you consent to Apple using the

contents of these files to improve Apple products.

Press 'Enter' to continue.

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4. Sysdiagnose begins running. Below is what you might see as the process runs.

sysdiagnose version 3.0 (56)

Starting time sensitive tasks..

Running ps

Running thread-aware ps

Running fs_usage, spindump, vm_stat, and top

Running powermetrics

Starting graphics tasks..

Gathering Quartz Compositor information

Starting memory tasks..

Running lsof

Running footprint

Collecting file coordination status

Starting disk tasks..

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Running diskutil

Running gpt

Running hdiutil

Running BootCacheControl

Running df

Running mount

Starting kernel tasks..

Starting networking tasks..

Getting Wi-Fi info

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Getting opendirectory info

Getting NFS info

Running netstat

Running ifconfig

Running ipconfig

Running scutil

Running dig

Running get-network-info

Starting power tasks..

Running pmset

Starting configuration tasks..

Running system_profiler

Running ioreg

Gathering loginwindow logs

Gathering logs..

Generating microstackshot reports..

5. Once Sysdiagnose completes, a new window will pop up to your Mac temporary folder. The path is /var/tmp/ and inside you will have your Sysdiagnosefile - sysdiagnose_2017.02.04_14-20-31-0600.tar.gz – the file will vary in size but should be between 10 and 30megabytes.

6. You can open the .tar.gz file by double-clicking it. This will contain a folder of over 75 files and folders with the information Sysdiagnose collected.

Note: Sysdiagnose collects system info including wireless networks, network configurations, and system account usernames. While the info isn’t necessarily confidential, you should be aware it is being collected if you are sharing these reports.

Remember, Sysdiagnose compiles a detailed report of your Mac OS X machine in attempt to troubleshoot system software or hardware problems. Learn more about troubleshooting Mac X issues.

1. WiFi Problems

The WiFi problems are among the most common issues with OS X Yosemite. As a lag and unstable network can easily kill the productivity and fun, the slow internet seems to be a real problem. Apple had released v10.10.1 update in an attempt to fix this problem, however that’s not entirely the solution and many users still suffer from WiFi issues. How to get rid of the lingering wireless issues? Check the fix below.

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Fix WiFi problem:

Option 1: This issue usually pertains to an ineffective Wi-Fi driver. There are some common solutions to this problem as well as many other OS X . These may or may not works, but you are suggested to try those fixes before go to more complex settings: Reset hardware settings on your system, including the PRAM (see here) and System Management Controller (see here); Restart in to Safe Mode (hold Shift at startup), and then restart normally again; Run a permissions fix on the boot drive using Disk Utility; Disable any security software, including the OS X firewall in the Security system preferences; Restart your router, and update its firmware, if applicable.

Option 2: Check your wireless and router settings to verify the common internet issues and check if there are any interferences from other multiple wireless access points, as the 2.4 Ghz band Wi-Fi can easily affected by the cordless phones, neighboring routers, and other gadgets operating on the same frequency. It the Yosemite wifi issues still continue, try to set up a new Location to get rid of any possible configuration errors.

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Actually, nothing is perfect. Though you upgrade to macOS Sierra or Mac OS X 10.13, you will still face the macOS 10.13 update problems, like logout after macOS 10.13 upgrades, battery life drains fast issues, etc. Maybe the Wi-Fi problem is eased to certain extent, but another problem correspondingly ensue. Each has each troubles.