ssh-instance-function.sh

# ssh-instance - function to let you SSH to an EC2 instance ID
# Written by Mike Babineau <michael.babineau@gmail.com>. Original here: https://gist.github.com/mbabineau/319882/
# Put this in ~/.profile and reload your terminal

function ssh-instance() {
    if [ $# -lt 1 ] || [ $# -gt 3 ]; then
        echo "Usage: ssh-instance [-r region] <instance id>" 
    else 
        case "$1" in
            "-r")
                if [ $# -eq 3 ] && [ -n "`echo $3|egrep \"^i-[0-9a-z]+\"`" ]; then
                    ssh `ec2-describe-instances --region $2 $3|grep "^INSTANCE"|cut -f4`
                else
                    echo "Usage: ssh-instance [-r region] <instance id>"
                    return 1
                fi;;
            i-[0-9a-zA-Z]*)
                if [ $# -eq 3 ] && [ "$2" == "-r" ]; then
                    ssh `ec2-describe-instances --region $3 $1|grep "^INSTANCE"|cut -f4`
                elif [ $# -eq 1 ]; then
                    ssh `ec2-describe-instances $1|grep "^INSTANCE"|cut -f4`
                else
                    echo "Usage: ssh-instance [-r region] <instance id>"
                    return 1
                fi;;
            *)  
                echo "Usage: ssh-instance [-r region] <instance id>" 
            esac
    fi
    
    return 0
}

ssh-instance.sh

#!/bin/bash
# ssh-instance - script to let you SSH to an EC2 instance ID
# Written by Mike Babineau <michael.babineau@gmail.com>. Original here: https://gist.github.com/mbabineau/319882/

if [ $# -lt 1 ] || [ $# -gt 3 ]; then
    echo "Usage: ssh-instance [-r region] <instance id>"
else
    case "$1" in
        "-r")
            if [ $# -eq 3 ] && [ -n "`echo $3|egrep \"^i-[0-9a-z]+\"`" ]; then
                ssh `ec2-describe-instances --region $2 $3|grep "^INSTANCE"|cut -f4`
            else
                echo "Usage: ssh-instance [-r region] <instance id>"
                exit 1
            fi;;
        i-[0-9a-zA-Z]*)
            if [ $# -eq 3 ] && [ "$2" == "-r" ]; then
                ssh `ec2-describe-instances --region $3 $1|grep "^INSTANCE"|cut -f4`
            elif [ $# -eq 1 ]; then
                ssh `ec2-describe-instances $1|grep "^INSTANCE"|cut -f4`
            else
                echo "Usage: ssh-instance [-r region] <instance id>"
                exit 1
            fi;;
        *)
            echo "Usage: ssh-instance [-r region] <instance id>"
        esac
fi

exit 0