System Sensors

Your system likely has many sensors built in for displaying useful information on internal hardware status. For example, the commands below will help in finding the path to system temperature sensors. 

 user@host ~ $:sensors -f

coretemp-isa-0000

Adapter: ISA adapter

Package id 0: +80.6°F (high = +176.0°F, crit = +212.0°F)

Core 0: +73.4°F (high = +176.0°F, crit = +212.0°F)

Core 1: +73.4°F (high = +176.0°F, crit = +212.0°F)

Core 2: +69.8°F (high = +176.0°F, crit = +212.0°F)

Core 3: +68.0°F (high = +176.0°F, crit = +212.0°F)

acpitz-acpi-0

Adapter: ACPI interface

temp1: +82.0°F (crit = +221.0°F)

temp2: +85.6°F (crit = +221.0°F)

nouveau-pci-0100

Adapter: PCI adapter

GPU core: +0.97 V (min = +0.60 V, max = +1.27 V)

fan1: 691 RPM

temp1: +89.6°F (high = +203.0°F, hyst = +37.4°F)

 (crit = +221.0°F, hyst = +41.0°F)

 (emerg = +275.0°F, hyst = +41.0°F)

power1: 36.13 W (crit = 275.00 mW)

asus-isa-0000

Adapter: ISA adapter

cpu_fan: 0 RPM

 

 We can see that the CPU and GPU temperature sensors are known to our system as coretemp-isa-0000 and nouveau-pci-0100 , respectively. Run the command below to list the system path to all connected temperature devices by name, and cross-check these two outputs to gather the needed information for your sensors. 

 user@host ~ $:for i in /sys/class/hwmon/hwmon*/temp*_input; do echo "$(<$(dirname $i)/name): $(cat ${i%_*}_label 2>/dev/n

ull || echo $(basename ${i%_*})) $(readlink -f $i)"; done

acpitz: temp1 /sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp1_input

acpitz: temp2 /sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp2_input

coretemp: Package id 0 /sys/devices/platform/coretemp.0/hwmon/hwmon2/temp1_input

coretemp: Core 0 /sys/devices/platform/coretemp.0/hwmon/hwmon2/temp2_input

coretemp: Core 1 /sys/devices/platform/coretemp.0/hwmon/hwmon2/temp3_input

coretemp: Core 2 /sys/devices/platform/coretemp.0/hwmon/hwmon2/temp4_input

coretemp: Core 3 /sys/devices/platform/coretemp.0/hwmon/hwmon2/temp5_input

nouveau: temp1 /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/hwmon/hwmon3/temp1_input

 

 Displays 

 When attempting to manage displays, whether its the orientation or enabling / disabling, look to the man pages for xrandr . See the commands below for some examples. 

 # Output information on displays

xrandr

# List the output names for displays

xrandr --output

# Move DP-2 to the right of HDMI-1

xrandr --output DP-2 --right-of HDMI-1

``

#### Timezone

To see date / time, run `date`

To adjust local TZ settings, run `tzselect`. Pay attention to the final output of this tool as it will explain how to make your change permenant. For me, I had to add the following to the end of my `~/.profile` :

```bash

TZ='America/New_York'; export TZ

 

 Memory 

 Some useful commands to find information on memory usage - 

 # Output various memory details

cat /proc/meminfo

#Can be used with grep, awk, etc for more specific output..

# ex) Show MiB of memory available

grep -w MemAvailable: /proc/meminfo | awk '{print $2 / 1024 "MiB"}'

 

 Input Devices 

 Run the following to get information on input devices attached to the machine - 

 # In the output shown below, my keyboard is AT Translated Set 2 keyboard

xinput list

# Example output:

⎡ Virtual core pointer id=2 [master pointer (3)]

⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]

⎜ ↳ Elan Touchpad id=10 [slave pointer (2)]

⎣ Virtual core keyboard id=3 [master keyboard (2)]

 ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]

 ↳ Power Button id=6 [slave keyboard (3)]

 ↳ Power Button id=7 [slave keyboard (3)]

 ↳ Sleep Button id=8 [slave keyboard (3)]

 ↳ TOSHIBA Web Camera - HD: TOSHIB id=9 [slave keyboard (3)]

 ↳ AT Translated Set 2 keyboard id=11 [slave keyboard (3)] 

# Test the device.. 

xinput test "AT Translated Set 2 keyboard"

# Example output:

key release 36

key press 40

dkey release 40

key press 50

key release 50

# The output above shows me pressing / releasing keys in real time.

# Exit with CTRL-C

 

 Power Supplies / AC Adapters 

 # List power supplies, AC adapters -

ls -l /sys/class/power_supply/

# Example output...

lrwxrwxrwx 1 root root 0 Mar 23 23:02 AC -> ../../devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/PNP0C09:00/ACPI0003:00/power_supply/AC

lrwxrwxrwx 1 root root 0 Mar 23 23:02 BAT0 -> ../../devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/PNP0C09:00/PNP0C0A:00/power_supply/BAT0

# Above, my battery is seen as BAT0, my AC port for charging is AC