wifi scan (parser)

#!/bin/bash

#     # iwlist wlan0 scan | bash wifi.sh

# http://stackoverflow.com/questions/25394772/parsing-iwlist-scan-using-bash

## print header lines
#echo ""
#echo " mac                 essid         frq   chn qual   lvl  enc   ie   protocol  bitRates  groupCipher   authenticationSuites"


cat <<EOF
{
 "wifi" : [
EOF

while IFS= read -r line; do

    ## test line contenst and parse as required
    [[ "$line" =~ Address ]] && mac=${line##*ss: }
    [[ "$line" =~ 'Bit Rates' ]] && bitRates=${line##*Bit Rates:}
    [[ "$line" =~ 'Group Cipher' ]] && groupCipher=${line##*Group Cipher :}
    [[ "$line" =~ 'Authentication Suites' ]] && authenticationSuites=${line##*Authentication Suites (*) :}
    [[ "$line" =~ Protocol ]] && protocol=${line##*Protocol:}
    [[ "$line" =~ IE:  ]] && ie=${line##*IE: }
    [[ "$line" =~ \(Channel ]] && { chn=${line##*nel }; chn=${chn:0:$((${#chn}-1))}; }
    [[ "$line" =~ Frequen ]] && { frq=${line##*ncy:}; frq=${frq%% *}; }
    [[ "$line" =~ Quality ]] && {
        qual=${line##*ity=}
        qual=${qual%% *}
        lvl=${line##*evel=}
        lvl=${lvl%% *}
    }
    [[ "$line" =~ Encrypt ]] && enc=${line##*key:}
    [[ "$line" =~ ESSID ]] && {
        essid=${line##*ID:}

        #echo " $mac | $essid | $frq | $chn | $qual | $lvl | $enc | $ie | $protocol | $bitRates | $groupCipher | $authenticationSuites"  # output after ESSID

cat <<EOF

 {
 "ssid" : $essid,
 "bssid" : "$mac",
 "freq" : $frq,
 "channel" : $chn ,
 "signal_level" : "$lvl",
 "quality" : "$qual",
 "enc" : "$enc",
 "ie" : "$ie",
 "protocol" : "$protocol",
 "bit_rates" : "$bitRates",
 "group_cipher" : "$groupCipher",
 "authenticationSuites" : "$authenticationSuites"
 },

EOF


    }

done

echo " ]  }"