# poller.sh
HOSTS=("server1" "server2")
FILE="/tmp/poller"
DATA=$1

# Iterate the hosts to issue command
for i in ${HOSTS[@]}; do

    # Tell host to run command
    echo "Issuing to $i"
    ssh $i "echo \"$DATA\" > $FILE" 2> /dev/null

    # Poll until host has completed command
    RUN=1
    while [ $RUN -eq 1 ]; do
        RESULT=$(ssh $i ls $FILE 2> /dev/null)
        if [ $RESULT ]; then
            echo "File detected, waiting"
            sleep 1
        else
            echo "File removed"
            echo "Continuing"
            RUN=0
        fi
    done

done

# listener.sh
FILE="/tmp/poller"

while [ 1 ]; do
    if [ -f $FILE ]; then
        echo "File detected"
        FC=$(cat $FILE)
        echo "File data: $FC"
        sleep 3
        echo "Removing file"
        rm $FILE
    fi
done