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Many distros is replacing ifconfig with ip so I would discourage the use of ifconfig.
ifconfig
ip
To show the wlan0 interface:
ip alink show wlan0
or
cat /sys/class/net/wlan0/address
Ref: https://www.linux.com/learn/replacing-ifconfig-ip
ip a show wlan0
ip link show wlan0
ip -a show wlan0