run_on_hosts

#!/bin/bash

# Find hosts matching pattern in ssh_config and run command on each.
# As pattern is an argument to egrep, but is also injected into a string
# which is evaluated, you can hack the input to do weird useful things,
# like pass options to egrep or pipe the output through another command.

usage() {
  echo "Usage: $0 [pattern] [command]"
}

if [ "$1" == "" ] || [ "$2" == "" ]; then
  usage
  exit 1
fi

hosts=`eval "egrep '^Host ' ~/.ssh/config | egrep $1" | awk '{print $NF}'`

for host in $hosts; do
  printf "\e[32mConnecting to $host...\e[0m\n"
  printf "\e[33m* executing \"$2\"\e[0m\n"
  ssh -t $host "$2"
  echo
done