command-jumping-to-servers.sh

LIST=`fleetctl list-machines | grep worker | awk '{print $2}'`
for item in $LIST; do echo $item; done
for item in $LIST; do ssh -A core@$item; done

LIST=`fleetctl list-machines | awk '{print $2}'`
for item in $LIST; do echo $item; done
for item in $LIST; do ssh -A core@$item echo "xxx" >> ~/.ssh/authorized_keys; done

LIST=`fleetctl list-machines | awk '{print $2}'`
for item in $LIST; do echo $item; done
for item in $LIST; do echo item=$item; ssh -A core@$item cat ~/.ssh/authorized_keys | grep xxx; done

Update:

LIST=$(fleetctl list-machines | grep worker |awk '{print $2}')

for item in $LIST; \
  do echo "Found Machine IP=$item"; \
done

for item in $LIST; do \
  echo "Machine IP=$item" && \
  ssh -A -o StrictHostKeyChecking=no core@$item \
    hostname \
; done

for item in $LIST; do \
  echo "Machine IP=$item" && \
  ssh -A -o StrictHostKeyChecking=no core@$item \
    echo "xxx" >> ~/.ssh/authorized_keys \
; done