multi_ssh.sh

#!/bin/bash

# Assumes iTerm

while getopts ":u:" opt
do
    case $opt in
        u) user="$OPTARG"
        ;;
        \?) echo "Invalid option -$OPTARG" && exit 1 >&2
        ;;
    esac
done

if [ "$user" == "" ] 
then
    printf "\n\tUsage\n\t./open_shells.sh -u \$YOU host1 host2 .. hostN\n\n\tAssumes your authentication is managed by ~/.ssh/config\n\n"
    exit 1
fi

# shift parameters '-u' and its argument
shift 
shift

for server in "$@"
do
    printf "Server is %s\n" "$server"
    osascript   \
    -e 'tell application "System Events" to tell process "iTerm" to keystroke "t" using command down' \
    -e 'tell application "System Events" to tell process "iTerm" to keystroke "ssh '$user'@'$server'"' \
    -e 'tell application "System Events" to tell process "iTerm" to keystroke return' 
done

# close invoking session
osascript -e 'tell application "iTerm" to terminate the first session of the first terminal'