To catch the handshake you would need the EAPOL handshake packets. First set the wireless adapter in monitor mode:

airmon-ng start wlan0

Then run airodump on everything to see the network that you are targeting.
airodump-ng wlan0mon

then you see the channel and bssid and then type:
airodump-ng --bssid AA:BB:CC:DD:EE:FF:00 --channel 11 --write attack-wpa-file wlan0mon


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