Shell Programming and Scripting

#!/bin/bash

 # WiFi Commander, a lazy way to lazily connect to the WiFi

 # Updated: 17-2-16, Version 2.3

 # 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"

wa () {
sudo ifconfig | grep -Eow "wlan0"; sudo ifconfig wlan0 up
if [ "$?" -eq "0" ];
then echo; echo "wlan0 is present."; sudo ifconfig wlan0 up
else echo; echo "wlan0 is not present. Testing for wlan0mon...."; echo; sleep .75; wa2
fi
}

wa2 () {
sudo ifconfig | grep -Eow "wlan0mon"; sudo ifconfig wlan0mon up
if [ "$?" -eq "0" ];
then echo; echo "wlan0mon is present."; sudo ifconfig wlan0mon up
else echo; echo "No wireless devices are present."
fi
}

scan () {
echo; echo $(sudo iwlist scanning | grep -E "Quality|Signal level|Encryption key|ESSID"); echo
if [ "$?" -ne "0" ];
then echo; echo $(sudo iwlist scanning | grep -E "Quality|Signal level|Encryption key|ESSID"); echo
fi
}

test () {
echo; ping -c 1 $DDG
if [ "$?" -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: Testing for wlan0mon...."; echo; sleep .75; discon2
fi
}

discon2 () {
nmcli d disconnect wlan0mon
if [ "$?" -eq "10" ];
then echo; echo "Error with the WiFi 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 WiFi Commander."; sleep .75; echo

PS3="WiFi Command: "
echo "Command Menu:"; echo; select command in "Activate Wireless device" "Scan for WiFi" "Connect to new WiFi" "Connect to a Saved Connection" "Test Connection" "Disconnect from WiFi" "View Saved Connections" "Delete a Saved Connection" "Launch Browser (W3M)" "Exit"
do
case $command in
"Activate Wireless device") wa;;
"Scan for WiFi") scan;;
"Connect to new WiFi") echo; echo "SSID:"; echo; read ssid; echo; echo "Key:"; echo; read passwd; sudo nmcli d wifi connect "$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 WiFi") discon;;
"View Saved Connections") echo; echo $(nmcli c); 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