IStats is a command line tool that allows you to easily get CPU temperature, fan speed, and battery information on OS X.

Portal: iStats

The installation

Brew Installation

brew install iStats
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Install using gem

gem install iStats
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Note

If you are running an older version of OS X and the installation fails, you may want to try running this command instead:

sudo ARCHFLAGS=-Wno error=unused command line argument hard error in future gem install iStats
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use

Easy to see

Open the command line and enter the command

istats
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The response is as follows

--- CPU Stats ---
CPU temp:               50.5°C ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁in system:   2
Fan 0 speed:            2168The RPM ▁ ▂ ▃ ▅ ▆ ▇ Fan1 speed:            2003RPM ▁ ▁ ▁ Hf news Cycle count:168▁ ▂ ▃ ▅ ▆ ▇16.8%
Max cycles:             1000
Current charge:         5938MAh ▁ ▂ ▃ ▅ ▆ ▇100%
Maximum charge:         5938MAh ▁ ▂ ▃ ▅ ▆ ▇89.0%
Design capacity:        6669 mAh
Battery temp:           35.3°C

For more stats run `istats extra` and follow the instructions.
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Details see

Open the command line and enter the command

istats scan
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The response is as follows

No config file /Users/meng/.iStats/sensors.conf found .. Run scan
Scanning keys...

TaLC Unknown:           34.19° C ▁ ▂ ▃ ▅ ▆ ▇ TaRC Unknown:35.19°C (▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁1 Proximity: 46.13° C ▁ ▂ ▃ ▅ ▆ ▇ Th2H Unknown:44.88▃▅▆ ▃▅▆ Palm rest L:33.13▃▅▆ ▃▅▆ Ts0S Memory Bank Proximity:38.31° C ▁ ▂ ▃ ▅ ▆ ▇ Ts1P Unknown:30.44° C ▁ ▂ ▃ ▅ ▆ ▇ Ts1S Unknown:37.42° C ▁ ▂ ▃ ▅ ▆ ▇ Ts2S Unknown:37.08° C ▁ ▂ ▃ ▅ ▆ ▇ TA0V Unknown:30.38° C ▁ ▂ ▃ ▅ ▆ ▇ TBXT Unknown:35.09▃▅▆ ▃▅▆ TB0T Battery TS_MAX:35.09° C ▁ ▂ ▃ ▅ ▆ ▇ TB1T '1:         32.69° C ▁ ▂ ▃ ▅ ▆ ▇ TB2T '2:         35.09▃▅▆ ▃▅▆ TCGC PECI GPU:58.0°C () ▃▅▆ ▃▅▆ TCMc Unknown: -128.0▃▅▆ ▃▅▆ TCSA PECI SA:59.0° C ▁ ▂ ▃ ▅ ▆ ▇ TCTD Unknown:0.17▃▅▆ TCXC PECI CPU at °C64.59° C ▁ ▂ ▃ ▅ ▆ ▇ TC0E CPU0?? :63.34° C ▁ ▂ ▃ ▅ ▆ ▇ TC0F CPU0?? :63.78° C ▁ ▂ ▃ ▅ ▆ ▇ TC0P CPU0 Proximity:   49.81° C ▁ ▂ ▃ ▅ ▆ ▇ TC1C Core1:            64.0° C ▁ ▂ ▃ ▅ ▆ ▇ TC2C Core2:            61.0° C ▁ ▂ ▃ ▅ ▆ ▇ TC3C Core3:            62.0° C ▁ ▂ ▃ ▅ ▆ ▇ TC4C Core4:            60.0° C ▁ ▂ ▃ ▅ ▆ ▇ TGDD Unknown:50.0° C ▁ ▂ ▃ ▅ ▆ ▇ TGVP Unknown:44.56° C ▁ ▂ ▃ ▅ ▆ ▇ TG0D GPU0 Die:         54.06° C ▁ ▂ ▃ ▅ ▆ ▇ TG0F Unknown:50.75° C ▁ ▂ ▃ ▅ ▆ ▇ TG0P GPU0 Proximity:   48.63° C ▁ ▂ ▃ ▅ ▆ ▇ TH0a Unknown:34.88° C ▁ ▂ ▃ ▅ ▆ ▇ TH0b Unknown:33.63° C ▁ ▂ ▃ ▅ ▆ ▇ TH0c Unknown:35.0°C ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁127.0° C ▁ ▂ ▃ ▅ ▆ ▇ TH0A Unknown:34.88° C ▁ ▂ ▃ ▅ ▆ ▇ TH0B Unknown:33.63° C ▁ ▂ ▃ ▅ ▆ ▇ TH0C Unknown:35.0°C ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁42.0°C ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁ ▁42.0▃▅▆ ▃▅▆ TM0P Memory Slot Proximity:46.44▃▅▆ ▃▅▆ TPCD Platform Controller Hub Die:38.0° C ▁ ▂ ▃ ▅ ▆ ▇ TTLD Unknown:34.13° C ▁ ▂ ▃ ▅ ▆ ▇ TTRD Unknown:32.63▃▅▆ ▃▅▆ TW0P AirPort Proximity:47.38°C () ▃▅▆ ▃▅▆ Done scanning keys. All keys are disabled bydefault. Use `istats enable [key]` to enable specific keys or `istats enable all`.
The enabled sensors will show up when running `istats` or `istats extra`.
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conclusion

Very simple a command line tool, you can view Mac temperature information, fan information, etc.