Shell Programming and Scripting

#!/bin/bash

 # Wi-Fi Commander, a lazy way to lazily connect to the WiFi

 # Updated: 15-8-16, Version 3.5

 # This script requires that nmcli, w3m, and w3m-img (if
 # you want to be able to see pictures), are all installed
 # on the computer running it

 # You must be a sudoer or root to use this script


DDG="www.duckduckgo.com"


test () {
echo; nmcli c show --active
echo; ping -q -c 3 $DDG
if [ "$?" -eq "0" ];
then echo; echo "Connection Successful."
else echo; echo "Connection Unsuccessful."
fi
}

discon () {
nmcli d disconnect wlan0
if [ "$?" -eq "10" ];
then echo; echo "wlan0 not found." ; echo; sleep .75; discon2
fi
}

discon2 () {
echo $(sudo ifconfig -a -s); echo; echo "Deactivate which connection??"; read dcon; nmcli d disconnect "$dcon"; echo
if [ "$?" -eq "10" ];
then echo; echo "Error with the Wi-Fi Adapter."
fi
}

interweb () {
echo; w3m $DDG
if [ "$?" -eq "0" ];
then echo " ";
else echo; echo "You are not connected to the internet."
fi
}


echo; echo "Welcome to Wi-Fi Commander."; sleep .75; echo

PS3="Wi-Fi Command: "
echo "Command Menu:"; echo; select command in "Activate Wireless device" "Scan for Wi-Fi" "Connect to new Wi-Fi" "Connect to a Saved Connection" "Test Connection" "Disconnect from Wi-Fi" "View Saved Connections" "View a Saved Connection's password" "Deactivate Wireless device" "Delete a Saved Connection" "Launch Browser (W3M)" "Exit"
do
case $command in
"Activate Wireless device") echo $(sudo ifconfig -a -s); echo; echo "Activate which device??"; echo; read device; sudo ifconfig "$device" up; echo;;
"Scan for Wi-Fi") echo; echo $(sudo iwlist scanning | grep -E "Quality|Signal level|Encryption key|ESSID"); echo;;
"Connect to new Wi-Fi") echo; echo "SSID:"; echo; read ssid; echo; echo "Key:"; echo; read -s passwd; sudo nmcli d wifi connect "$ssid" password "$passwd"; echo;;
"Connect to a Saved Connection") echo $(nmcli c); echo; echo "Connect to??"; echo; read ssid; nmcli c up id "$ssid";;
"Test Connection") test;;
"Disconnect from Wi-Fi") discon;;
"View Saved Connections") echo; echo $(nmcli c); echo;;
"View a Saved Connection's password") echo; echo $(nmcli c); echo; echo "Which Saved Connection??"; echo; read ssid; echo; sudo -k echo&&echo $(nmcli --show-secrets connection show "$ssid" | grep -E "802-11-wireless-security.psk:");;
"Deactivate Wireless device") echo $(sudo ifconfig -a -s); echo; echo "Deactivate which device??"; echo; read device; sudo ifconfig "$device" down; echo;;
"Delete a Saved Connection") echo; echo $(nmcli c); echo; echo "Delete which??"; echo; read ssid; nmcli c delete id "$ssid";;
"Launch Browser (W3M)") interweb;;
"Exit") echo; echo "Goodbye."; echo; exit;;
*) echo; echo "Command not recognised.";;
esac
echo; echo "Press Enter to view the Command Menu again."; echo
done