This is antithesis to the OPs question, but I had to share it. Sure, the fans are always running now, but I can hardly hear them, and my temperature gauges look a lot healthier. Reading hardware information from command line with built-in tools. Ive found the algorithm to be unsuitable for me, which is why I use smcFanControl and run the fans at a preset value on my iMac.The above article and the script it contains was designed for Mac OS X 10.4.3. This article, get sensor information, shows how to use ioreg to extract the fan speed information with: ioreg -c IOHWSensor | grep -B3 -A11 '"type" = "fanspeed"' MacsFanControl is currently working on M1 support. Both these apps don’t currently support M1 model. Edit: whoops I just noticed you mentioned M1. Probably there are other options as well, but I’ve used these with success in the past. See Can I get the CPU temperature and fan speed from the command line in OS X? Pre-Mac OS X 10.5 You can use either smcFanControl (Free/OpenSource) or MacsFanControl (Paid/Free, Closed Source). If you have any problem with this app, you can use the verified control method To fix it. Like every other fan control, it allows the users to control the fan. Other tools and applications exist, including Temperature Monitor. Thinkpad Fan Controller (tpfancontrol) Tpfancontrol is one of the oldest software for controlling fan speed. This is a computationally expensive process, even when run for one second. Spindump requires administrator privileges and when run manually, spindump samples user and kernel stacks for every process in the system. This article, OS X: Current CPU temperature on command line, talks about the project and how to extract the fan speed: smc -k TC0D -r | sed 's/.*bytes \(.*\))/\1/' |sed 's/\(*\)/0x\1/g' | perl -ne 'chomp ($low,$high) = split(/ /) print (((hex($low)*256)+hex($high))/4/64) print "C\n" ' The open source project Fan Control includes a command line tool that provides fan speed information. It appears no tool, installed by default on OS X, exposes this information through the terminal. Since Mac OS X 10.5, you need to use a third party piece of software to access the fan speed information. See the smc manual page for more options. smcFanControl allows you to increase your minimum fan speed to make your Intel Mac run coo. You can use smc to get fan speed information via Terminal.app: smc -f smcFanControl lets the user set a minimum speed for built-in fans. There really is no need for third-party fan controls. The exhaust fan and intake fan are in the front and back of the PC. Easier to boost and keep air circulating. You mention in your comments having smcFanControl installed this open source project includes the command line tool smc. I've used SMCFanControl 2.x on Mac Pro for 4 years because the fans kick in late, too late, and are configured for quiet running and then it is too hard to expel heat.
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