Get the ESSID value and Signal level value in ubuntu using iwlist and other command like grep,awk or others

Get the ESSID value and Signal level value in ubuntu using iwlist and
other command like grep,awk or others

Assuming after issuing the iwlist command I get -30 dbm as the signal
level and TP_LINK as the ESSID. What is the exact command to get -30 and
TP_LINK. I mean a command to get the value of ESSID and Signal level(a
value alone like -30 and TP_LINK).