Export output of iwlist as CSV format

scan.sh

#!/bin/bash

readonly TMPSCAN=/tmp/scan
readonly NETWORKS=/tmp/networks
readonly  NIC=wlan0

scan () {

rm -f $NETWORKS

sudo iwlist $NIC scan > $TMPSCAN

ssids=($(cat $TMPSCAN | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}'))
len=${#ssids[@]}

for ssid in ${ssids[@]}
    do
        cell=$(sed -n "/$ssid/,/Cell\ [0-9]/p" $TMPSCAN)
        # array (chan enc essid)
        cv=($(echo "$cell" | grep -E -o '(Channel:.+)|(Encryption.+)|(ESSID:.+)|(Frequency:[0-9\.]+)|(Quality=[0-9/]+)|(level=[0-9\-]+)' | sed 's/.*://'))
        # echo ${cv[*]}
        chan=${cv[0]}
        enc=${cv[1]}
        essid=${cv[@]:2}
        quality=${cv[2]}
        signal_level=${cv[3]}
        # echo $signal_level
        # echo $(echo $essid | grep -o -E "\".+\"" )
        #echo $enc
        # echo ${quality//Quality=/}
        # echo "$cell"
        if [[ $(echo $essid | grep -o -E "(on|off)" ) == "on" ]]; then
            if [[ "$cell" == *WPA[0-9]\ Version* ]]; then
                enc_type=wpa
            else
                enc_type=wep
            fi 
        fi

        if [[ $(echo $essid | grep -o -E "\".+\"" ) == '""' ]]; then
            essid="<hidden>"
        fi
        timestamp=$(date -u)
        echo $ssid","$(echo $essid | grep -o -E "\".+\"" )","$chan","${quality//Quality=/}","${signal_level//level=/}","$enc","$timestamp","$(echo $essid | grep -o -E "(on|off)" )","$enc_type >> $NETWORKS
    done
}                                                                                                                                          

scan
# ssid,essid,channel,quality,signal_level,frequency,timestamp,encryption_status,encryption_type
cat $NETWORKS