On Sat, Aug 22, 2020 at 1:57 AM ToddAndMargo via users
<users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Followup: I create a number of bash functions to
> handle the task(s). Thank you all for the help!
>
>
> function GetIP () {
> echo "$(ip -f inet route | grep -i $InetDev | grep -i src | awk
> '{print $9}')"
> }
>
>
> function CheckInternetStatus () {
> local GoogleDNS="8.8.8.8";
> local RtnStr="$( ping -W .1 -c 1 $GoogleDNS | grep loss );"
> # echo "RtnStatus = <$?> RtnStr = <$RtnStr>" > "/dev/tty"
> if [[ "$RtnStr" == *", 0% packet loss"* ]]; then
> echo "UP"
> else
> echo "DOWN"
> fi
> }
>
>
> function GetPublicIP () {
> local WIP=$(dig +short myip.opendns.com @resolver1.opendns.com)
> # echo "WIP = <$WIP>" > "/dev/tty"
> if [[ "$WIP" == *"not found"* || "$WIP" == *"no servers could be
> reached"* ]]; then
> WIP="Not Found"
> fi
>
> echo $WIP
> }
>
>
> function GetGW () {
> echo "$(route -n | grep eno2 | grep UG | sed -n 1,1p | awk '{print
> $2}')"
> }
>
>
> function UpDownedEthernetDevices () {
> local State=""
> local LinkState=""
>
> for Line in $(nmcli device | grep ethernet | awk '{print $1}'); do
> State="$(nmcli device | grep $Line | awk '{print $3}')"
> LinkState="$(ip address | grep eno2 | awk -F "," '{print $3}')"
> # echo "Line = <$Line> State = <$State> LinkState =
> <$LinkState>')" > "/dev/tty"
>
> if [ "$State" == "disconnected" ]; then
> echo "Reconnecting $Line" > "/dev/tty"
> /usr/bin/nmcli device disconnect $Line
> /usr/bin/nmcli device connect $Line
> /usr/bin/nmcli connection down $Line
> /usr/bin/nmcli connection up $Line
>
> elif [[ $LinkState == "DOWN" ]]; then
> echo "Reattaching (link) $Line" > "/dev/tty"
> beesu "ip link set $Line down; ip link set $Line up;"
>
> echo "Reconnecting $Line" > "/dev/tty"
> /usr/bin/nmcli connection down $Line
> /usr/bin/nmcli connection up $Line
> fi
> done
> }
>
>
> function DisplayStatus () {
> NotifySound
>
> local Msg=""
> local GW=""
> local IP=""
> local InternetStatus="$(CheckInternetStatus)"
> local PublicIP=""
>
> # if [ -n "$(netstat -rn | grep -i $InetDev | grep -i UG)" ]; then
> if [ "$InternetStatus" == "UP" ]; then
> GW="$(GetGW)"
> IP="$(GetIP)"
> PublicIP="$(GetPublicIP)"
>
> # Msg+="$InetDev successfully started and is a gateway\n\n"
> Msg+="Internet is $InternetStatus\n"
> Msg+="IP=$IP\n"
> Msg+="gw=$GW\n"
> Msg+="Public IP=$PublicIP\n"
>
> echo -e $Msg > "/dev/tty"
> zenity --title "$Title Status" --info --text "$Msg" --width=250
>
> else
> Msg="Internet ($InetDev) is down"
> echo -e $Msg > "/dev/tty"
> zenity --title "$Title Status" --info --text "$Msg" --width=200
> fi
> }
Without looking at what your functions are actually doing:-
Things that I don't understand:
1) Why do you use "$InetDev" in GetIP and "eno2 in GetGW and
UpDownedEthernetDevices?
2) Why do you use "-i" for grep in GetIP?
3) Why do you use "sed -n 1,1p" in GetGW?
4) Why do you use "route" in GetGW when you're using "ip" elsewhere
and "net-tools" isn't installed by default?
Use of awk
1) "grep search | awk {...}" is the same as "awk '/search/ {...}"
2) "grep search1 | grep search2 | awk {...}" is the same as "awk
'/search1/ && /search2/ {...}"
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