# in /etc/wpa_supplicant/wpa_supplicant.conf
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=CN

network={
        ssid="WIFI-NAME"
        psk="password"
}

# in /etc/dhcpcd.conf
# set wifi static ip per ssid
ssid WIFI-Name
static ip_address=10.2.32.50/24
static routers=10.2.32.1
static domain_name_servers=8.8.8.8

$ sudo vcgencmd measure_temp
temp=44.4'C

# use `sensors` in Ubuntu given package `lm-sensors` installed.

$ sudo vcgencmd commands
commands="vcos, ap_output_control, ap_output_post_processing, vchi_test_init, vchi_test_exit, vctest_memmap, vctest_start, vctest_stop, vctest_set, vctest_get, pm_set_policy, pm_get_status, pm_show_stats, pm_start_logging, pm_stop_logging, version, commands, set_vll_dir, set_backlight, set_logging, get_lcd_info, arbiter, cache_flush, otp_dump, test_result, codec_enabled, get_camera, get_mem, measure_clock, measure_volts, enable_clock, scaling_kernel, scaling_sharpness, get_hvs_asserts, get_throttled, measure_temp, get_config, hdmi_ntsc_freqs, hdmi_adjust_clock, hdmi_status_show, hvs_update_fields, pwm_speedup, force_audio, hdmi_stream_channels, hdmi_channel_map, display_power, read_ring_osc, memtest, dispmanx_list, get_rsts, schmoo, render_bar, disk_notify, inuse_notify, sus_suspend, sus_status, sus_is_enabled, sus_stop_test_thread, egl_platform_switch, mem_validate, mem_oom, mem_reloc_stats, hdmi_cvt, hdmi_timings, readmr, pmicrd, pmicwr, bootloader_version, bootloader_config, file"

# Disable the PWR LED
dtparam=pwr_led_trigger=none
dtparam=pwr_led_activelow=off
# Disable the Activity LED
dtparam=act_led_trigger=none
dtparam=act_led_activelow=off
# Disable ethernet port LEDs
dtparam=eth_led0=4
dtparam=eth_led1=4

# echo 0 > /sys/class/leds/led1/brightness

 # uncomment if hdmi display is not detected and composite is being output
-#hdmi_force_hotplug=1
+hdmi_force_hotplug=1

 # uncomment to force a specific HDMI mode (this will force VGA)
-#hdmi_group=1
-#hdmi_mode=1
+hdmi_group=2
+hdmi_mode=87
+hdmi_cvt=2560 1440 60 3

 # uncomment to force a HDMI mode rather than DVI. This can make audio work in
 # DMT (computer monitor) modes
-#hdmi_drive=2
+hdmi_drive=2

 # uncomment to increase signal to HDMI, if you have interference, blanking, or
 # no display

sudo apt install guake
    ```