gistfile1.sh

#!/bin/bash


# define some functions
######################################

# command
run_command () {
     echo ""
     echo "----------------------"
     echo "Running '$COMMAND' on $SERVER"
     echo "$COMMAND" | ssh "$SSH_OPTIONS" "$SERVER" /bin/bash
}

######################################

# if next arg is a file, then use that as the list of servers
# otherwise use the remaining args as your server list
# and then do it!
if [ -f "$1" ]; then
     while read SERVER; do
          run_command
     done < "$1"
else
     for SERVER in "$@"; do
          run_command
     done
fi