linux: auto connect wifi (for wpa2 encryption)

wifi.sh

ssid=${1:-$SSID}
key=${2:-$PASSWORD}
test -n "$ssid" || { echo '[required args] : ssid password'; exit 0; }

pkgs='wpa_passphrase' #dhcp-gtk
type $pkgs || ( sudo apt-get install $pkgs)

connect_passwordless_wifi(){
commander sudo ifconfig $device up
commander sudo iw dev $device connect $ssid
commander sudo dhcpcd $device
}

connect_using_wpa2(){
commander "sudo wpa_supplicant  -D$driver -i$device -c$file" 
commander sudo dhclient $device #get ip address
commander cat /etc/resolv.conf
commander ping1
}

troubles(){
ifconfig_up | grep  SIOCSIFFLAGS --color=always
sudo rfkill list | grep yes --color=auto
commander 'sudo rfkill unblock all'
sudo killall dhcpcd 
sudo killall dhclient 
sudo ifconfig $device down
}


ping_limit(){
[ $# -eq 0 ] && { print error 'supply a target address';return 1; }
local target="$1"
local num=${2:-1}
local cmd="ping -c $num $target"
( eval "$cmd" &>/dev/null )
local res=$?
indicator "$res"
return $res
}


ping1(){
local url=${1:-google.com}
commander "ping_limit 8.8.8.8" && { commander "ping_limit $url"; }
local res=$?
if [ $res -ne 0 ];then
#
print error "type: fix1"
#figlet1 ping loop
#ping1
fi
return $res

}

use_ssid(){
  local str="$1"
    case $str in
    4C64)
    export ssid=NAAN-4C64
    export key=517118249
    ;;
  mariana)
    export ssid='mariana';
  export key=123456789;
  ;;
  229F)
    export ssid='NAAN-229F';
  export key=00304f859;
  ;;
Linnovate)
    export ssid='Linnovate';
  export key=linnoxxx;
  ;;
  **)
    print error unknown ssid
    ;;

  esac
}



commander() { 
    local args=($@);
    local cmd="${args[@]}";
    echo 1>&2 [cmd] $cmd;
    eval "$cmd";
}




set_env(){
  export file_wpa=/tmp/wpa0
  export cmd_wpa="sudo wpa_passphrase $ssid $key"
  export driver=wext
  export device=wlan0
}

commander $cmd_wpa

cat $file_wpa | grep 'psk' | grep -v '\#' | cut -d'=' -f2