feat: native but poor method to get a component's temperature in linux

knowledge base/check the temperature of components.md

@@ -1,19 +1,35 @@
 # Check the temperature of components
 
-See [lm-sensors], [hddtemp] or [nvme-cli].
+## TL;DR
+
+```sh
+# Show the current temperature of thermal zones in millidegrees C.
+cat '/sys/class/thermal/thermal_zone'*'/temp'
+
+# Show the current temperature of the CPU package in millidegrees C.
+grep 'x86_pkg_temp' '/sys/class/thermal/thermal_zone'*'/type' | cut -d':' -f1 | xargs dirname | xargs -I{} cat {}'/temp'
+
+# Show all types with relative temperature in degrees C.
+paste <(cat /sys/class/thermal/thermal_zone*/type) <(cat /sys/class/thermal/thermal_zone*/temp) \
+| column -s $'\t' -t | sed 's/\(.\)..$/.\1°C/'
+```
+
+See [lm-sensors], [hddtemp] or [nvme-cli] for better ways.
 
 ## Sources
 
 - [How to check CPU temperature on Ubuntu Linux]
+- [Find out CPU temperature from the command-line]
 
 <!--
   References
   -->
 
 <!-- Knowledge base -->
-[hddtemp]: hddtemp.md
 [lm-sensors]: lm-sensors.md
 [nvme-cli]: nvme-cli.md
 
 <!-- Others -->
+[find out cpu temperature from the command-line]: https://www.baeldung.com/linux/cpu-temperature
+[hddtemp]: https://wiki.archlinux.org/title/Hddtemp
 [how to check cpu temperature on ubuntu linux]: https://www.cyberciti.biz/faq/how-to-check-cpu-temperature-on-ubuntu-linux/