Aircrack is a powerfull wireless sniffing tool. It can be used in many ways and has many options available. If you want to get hidden SSID with aircrack, then this will helps.
According to Wikipedia:
Aircrack-ng is a network software suite consisting of a detector, packet sniffer, WEP and WPA/WPA2-PSK cracker and analysis tool for 802.11 wireless [...]
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