# /etc/wpa_supplicant/wpa_supplicant.conf
ctrl_interface=/run/WPA_supplicant
update_config=1

# manually starting wpa_supplicant with specific configuration file
wpa_supplicant -B -i $INTFC -c /etc/wpa_supplicant/wpa_supplicant.conf

# it is possible to enable the dhcpcd->wpa_supplicant hook by creating this symlink:
ln -s /usr/share/dhcpcd/hooks/10-wpa_supplicant /usr/lib/dhcpcd/dhcpcd-hooks/
# after enabled, just executing dhcpcd will automatically launch wpa_supplicant if a valid configuration file exists
dhcpcd

# wpa_passphrase generates the appropriate network configuration stanza for a target SSID with encryption
# below will generate and append the stanza to the wpa_supplicant configuration file
wpa_passphrase "$SSID" "$PSK" | tee -a /etc/wpa_supplicant/wpa_supplicant.conf