iwconfig wlan0
Output:
wlan0 IEEE 802.11 ESSID:"SSID"
Mode:Managed Frequency:2.437 GHz Access Point: XX:XX:XX:XX:XX:XX
Bit Rate=5.5 Mb/s Tx-Power=10 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=40/70 Signal level=-70 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:19 Invalid misc:0 Missed beacon:0
Here the transmit power is Tx-Power=10 dBm. The following command can be used to change the WiFi transmit power:
sudo iwcofig wlan0 txpower 1
Then running the previous command will give the following output:
wlan0 IEEE 802.11 ESSID:"SSID"
Mode:Managed Frequency:2.437 GHz Access Point: XX:XX:XX:XX:XX:XX
Bit Rate=5.5 Mb/s Tx-Power=1 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=40/70 Signal level=-70 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:19 Invalid misc:0 Missed beacon:0
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