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netrefresh

#!/usr/bin/env bash

# This script is used to refresh the network connection on a Linux system

__netrefresh() {
    refreshed=0

    if [ -z "$1" ]
    then
        echo "Usage: netrefresh <interface>"
        return 1
    fi

    interface="$1"

    # ======================================================================= #
    #                                 dhclient                                #
    # ======================================================================= #
    if command -v dhclient &> /dev/null
    then
        echo "Found dhclient. Refreshing network..."
        sudo dhclient -r
        sudo dhclient
        refreshed=1
    fi

    # ======================================================================= #
    #                                networkctl                               #
    # ======================================================================= #
    if command -v networkctl &> /dev/null
    then
        echo "Found networkctl. Refreshing network..."
        sudo networkctl renew "$interface"
        refreshed=1
    fi

    # ======================================================================= #
    #                                systemctl                                #
    # ======================================================================= #
    if command -v systemctl &> /dev/null
    then
        echo "Found systemctl. Refreshing network..."
        sudo systemctl restart NetworkManager
        refreshed=1
    fi

    # ======================================================================= #
    #                                ifconfig                                 #
    # ======================================================================= #
    if command -v ifconfig &> /dev/null
    then
        echo "Found ifconfig. Refreshing network..."
        sudo ifconfig "$interface" down
        sudo ifconfig "$interface" up
        refreshed=1
    fi

    # ======================================================================= #
    #                                 ifdown                                  #
    # ======================================================================= #
    if command -v ifdown &> /dev/null || command -v ifup &> /dev/null
    then
        echo "Found ifdown and ifup. Refreshing network..."
        sudo ifdown "$interface" && sudo ifup "$interface"
        refreshed=1
    fi

    # ======================================================================= #
    #                           Unsuccessful refresh                          #
    # ======================================================================= #
    if [ "$refreshed" -eq 0 ]
    then
        echo "Could not refresh network. Please check the network configuration."
    fi
}

__netrefresh "$@"