runInHosts.sh

#!/bin/bash -e
# runInHosts.sh
# @author: Nestor Urquiza
# @created: 20130712
 
 
USAGE="Usage: `basename $0` <clusterNodes[user@host space delimited list or a path to a file comntaining the list]> <command>"
 
if [ $# -ne "2" ]; then
  echo $USAGE
  exit 1
fi
 
function run() {
  echo "$1: $(ssh $1 $2)"
}
 
clusterNodes=$1
command=$2
 
#If not a list then try path
if [[ ! "$clusterNodes" =~ ^.*@ ]]
then
  if [ ! -f "$clusterNodes" ]
  then
    echo $USAGE
    exit 1
  fi
  clusterNodes=`cat $clusterNodes`
fi
 
for host in $clusterNodes; do
  run $host "$command" &
done
wait