nmcli-script

Automating Wi-Fi Connection with a Bash Script using nmcli command

Managing Wi-Fi connections on a Linux system can be a repetitive task, but with the help of a bash script, you can streamline the process and save time. This is  a bash script that automates Wi-Fi connection management using the NetworkManager utility. This script allows you to scan for available networks, connect to a selected network, manage existing connections, and perform other related operations. The script in github repository...

#!/bin/bash

case $(ps -o stat= -p $$) in

    *+*)

        echo "continue..."

        ;;

    *)

        notify-send -t 2700 "clean exit" "the script is to be run only in terminal."

        exit 0

        ;;

esac

if which nmcli > /dev/null 2>&1; then

    echo "continue..."

else

    echo -e "nmcli command does not exit.\ninstall NetworkManager first.\nclean exit"

    exit 0

fi

# correcting input number as zero leading two digits

correctnumber () {

    case "$SELNUM" in

        [0-9])

            ZLNUM="$(printf "%02d" "$SELNUM")"

            ;;

        [0-9][0-9])

            ZLNUM="$SELNUM"

            ;;

        *)

            clear

            echo -e "selected wrong number...\nclean exit"

            exit 0

            ;;

    esac

}

# END OF of input correcting number as zero leading two digits

# password promt using read and showing *

enterwifipassword () {

    unset WFPASS

    local PROMPT="Enter WiFi Password: "

    while IFS= read -p "$PROMPT" -r -s -n1 PWCHAR; do

        if [[ -z "$PWCHAR" ]]; then

            break

        fi

        if [[ "$PWCHAR" == $'\177' ]]; then

            local PROMPT=$'\b \b'

            WFPASS="${WFPASS%?}"

        else

            local PROMPT="*"

            WFPASS+="$PWCHAR"

        fi

    done

    echo -e "\ngot WiFi Password and continue..."

}

# END OF password promt using read and showing *

# list available WiFi and connect to select WiFi

listavailablewifi () {

    mkdir -p /tmp/mshwifictl

    local FIELDS="BSSID,SSID,SECURITY,BARS,IN-USE"

    read -p "~~~ rescan or not? (y/N): " RESCYN

    case "$RESCYN" in

        y|yes|Y|Yes)

            nmcli --fields "$FIELDS" device wifi list --rescan yes | grep -wv ^BSSID | sed 's/*/-/g' > /tmp/mshwifictl/wifilist

            ;;

        *)

            nmcli --fields "$FIELDS" device wifi list | grep -wv ^BSSID | sed 's/*/-/g' > /tmp/mshwifictl/wifilist

            ;;

    esac

    local NUM=1

    local IFS=$'\n'

    for i in $(cat /tmp/mshwifictl/wifilist); do

        local NNUM=$(printf "%02d" "$NUM")

        echo ""$NNUM". "$i""

        local NUM=$((NUM+1))

    done > /tmp/mshwifictl/num-wifilist

}

connecttowifi () {

    echo "~~~ listing available WiFi..."

    cat /tmp/mshwifictl/num-wifilist | cut -d ' ' -f 1,4-

    read -p "~~~ select number to connect: " SELNUM

    correctnumber

    local BSSIDNUM=$(cat /tmp/mshwifictl/num-wifilist | grep -w ^$ZLNUM | cut -d ' ' -f 2)

    if [[ -z "$BSSIDNUM" ]]; then

        echo -e "selected BSSID is empty...\nclean exit"

        exit 0

    fi

    read -p "~~~ Password? (Y/n): " PYN

    case "$PYN" in

        n|no|N|No)

            nmcli device wifi connect "$BSSIDNUM" && exit 0 || echo "continue for password..."

            sleep 1

            enterwifipassword

            nmcli device wifi connect "$BSSIDNUM" password "$WFPASS"

            ;;

        *)

            enterwifipassword

            nmcli device wifi connect "$BSSIDNUM" password "$WFPASS"

            ;;

    esac

}

# END OF list available WiFi and connect to select WiFi

# list connections and do connection operations

listconnections () {

    mkdir -p /tmp/mshwifictl

    nmcli --fields UUID,NAME,TYPE,DEVICE connection show | grep -wv ^UUID > /tmp/mshwifictl/connectionlist

    local NUM=1

    local IFS=$'\n'

    for i in $(cat /tmp/mshwifictl/connectionlist); do

        local NNUM=$(printf "%02d" "$NUM")

        echo ""$NNUM". "$i""

        local NUM=$((NUM+1))

    done > /tmp/mshwifictl/num-connectionlist

}

connectionoperations () {

    echo "~~~ listing connections..."

    cat /tmp/mshwifictl/num-connectionlist | cut -d ' ' -f 1,4-

    read -p "~~~ select number of connection: " SELNUM

    correctnumber

    local SELCON=$(cat /tmp/mshwifictl/num-connectionlist | grep -w ^"$ZLNUM" | cut -d ' ' -f 2)

    echo "selected connection..."

    cat /tmp/mshwifictl/num-connectionlist | grep -w ^"$ZLNUM"

    echo "~~~ listing available operations..."

    echo -e "00. Exit\n01. Activate\n02. Deactivate\n03. Check Password\n04. Delete"

    read -p "~~~ select number of operation: " SELNUM

    correctnumber

    case "$ZLNUM" in

        00)

            exit 0

            ;;

        01)

            nmcli connection up "$SELCON"

            ;;

        02)

            nmcli connection down "$SELCON"

            ;;

        03)

            nmcli --show-secrets connection show "$SELCON" | grep security.psk:

            ;;

        04)

            nmcli connection delete "$SELCON"

            ;;

    esac

}

# END OF list connections and do connection operations

# END OF pre-testings and creating functions

# the script starts from here

echo "CURRENT..."

nmcli connection show --active

echo "~~~ listing available operations...

00. Exit

01. List Available WiFi and Set Up Connection

02. List Known Connections and up/down/check-password

03. Check Current WiFi Password

04. Rescan WiFi"

read -p "~~~ select number of operation: " SELNUM

correctnumber

case "$ZLNUM" in

    00)

        clear

        echo "clean exit" && exit 0

        ;;

    01)

        listavailablewifi

        clear

        connecttowifi

        ;;

    02)

        listconnections

        clear

        connectionoperations

        ;;

    03)

        clear

        nmcli device wifi show-password

        ;;

    04)

        clear

        nmcli device wifi rescan

        ;;

    *)

        clear

        echo -e "invalid number...\nclean exit"

        ;;

esac

# the script ENDS from here

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