ssh-all.sh

#!/bin/bash
# This be a script that sends a command via SSH to a list of hosts

function usage() {
    echo "usage: $0 [ -p password -u username ] command"
}

# I love bash
#hosts=$(sed -r '/^127.0.0.1.*$|^::1.*$|^#.*$|^\s*$/d'</etc/hosts | awk '{print                      $2}')
hosts="node1 node2 node3 node4"

# getopts
while getopts ':p:u:' flag; do
    case $flag in
    p)
        pass=$OPTARG
        ;;
    u)
        user=$OPTARG
        ;;
    esac
done

shift $((OPTIND-1))

if [[ $user == "" ]]; then
    user=hadoop
fi

if [[ $pass == "" ]]; then
    pass=appState
fi

if [[ $1 == "" ]]; then
    usage
    exit 1
else
    command="$1"
fi

for h in $hosts; do
    #echo sshpass -p $pass ssh $user@$h "$command"
    sshpass -p $pass ssh $user@$h "$command"
done