Mdthbs

I am trying to create a script that is capable of pinging multiple hosts from a text file in my directory.The hosts are with specific naming conventions and are grouped.E.g in the text fie

10.10.10.10 XX-YY_ZZ name of the host in form of URL | serial number
The file is not CSV but txt.
What I am hoping to make is something simple which when you run say " pingme YY" ( where YY is the in common element of the devices belonging to a certain location ) it would return me a result of e.g:

XX-YY_ZZ = ALIVE

Probably is very simple but I have no idea how to even start as this is Linux REDHAT we are running.

Any pointers and ideas would be appreciated.

I believe this will do what you want:

pingme () {

hostfile="/home/jbutryn/test/hostfile.txt"

IFS= mapfile -t  hosts < <(cat $hostfile)

for host in "${hosts[@]}"; do

    match=$(echo "$host" | grep -o "-$1_" | sed 's/-//' | sed 's/_//')

    if [[ "$match" = "$1" ]]; then

        hostname=$(echo "$host" | awk '{print $2}')

        ping -c1 -W1 $(echo "$host" | awk '{print $1}') > /dev/null

        if [[ $? = 0 ]]; then

            echo "$hostname is alive"

        elif [[ $? = 1 ]]; then

            echo "$hostname is dead"

        fi

    fi

done

}

You can run this function like: pingme UR01 and it should return something like:

[root@JBCLAMP001 test]# pingme CC

BB-CC_DD is dead

AA-CC_EE is alive

[root@JBCLAMP001 test]# pingme DD

CC-DD_EE is dead

CC-DD_JJ is alive

You can use the exit code from ping to determine if ping succeeded or failed.

ping HOST -c1 > /dev/null && echo "ALIVE" || echo "DEAD"

When host is alive exit code is 0, and for dead 1. To ping every host you can loop each line and use awk to get the first column which contains address/hostname.

exec 3<input.txt



while read -u3 line

do

    if [ "$line" == "" ]; then

        # skip empty lines

        continue

    fi



    ping -c1 $(echo "$line"| awk '{print $1}') > /dev/null



    if [ $? = 0 ]; then

        echo "$line=ALIVE"

    else

        echo "$line=DEAD"

    fi

done

EDIT:

If you want only to ping host by matching a single line in the file, you can grep it:

# find line for $host, only 1 line

line = grep "$HOST" input.txt |tail -n 1



# $($line |awk '{print $1}') outputs the first column of line (address)

ping -c1 $($line |awk '{print $1}') >/dev/null && echo "$line=ALIVE" || echo "$line=DEAD"