aws-profile.sh

#!/usr/bin/env bash

#
# INTRODUCTION
#
# Defines a function called aws-profile to list and select AWS profile
# to use. The function is meant for interactive use. You use it to
# select and set the current AWS Profile by setting the AWS_P#ROFILE
# environment variable.
#
# Note: You need the AWS CLI installed and configured. This should
# create the $HOME/.aws/credentials file that the function reads.
#
#
# INSTALLATION
#
# This script is available in the following Gist:
# https://gist.github.com/soren/dbfd37fc2ee66dec1f686012dfa23855
#
# You can either copy-n-paste from the Gist or clone the Gist using
# git, like this:
#
# cd <some directory>
# git clone https://gist.github.com/dbfd37fc2ee66dec1f686012dfa23855.git aws-profile
#
# Then add the following line to your ~/.bashrc:
#
# source "<some directory>/aws-profile/aws-profile.sh"
#
#
# USAGE
#
# When called, the function will display a numbered list of the names
# of all your AWS profiles.
#
# You will then be prompted to select a profile by entering the
# corresponding number from the list.
#
# If you don't enter a number, nothing will happen.
#
# If you enter a number that does not correspond to a number, you will
# be prompted again.
#
# If you select a profile that is currently set, that is the
# AWS_PROFILE environment variable is set to this, then a message
# notifying you will be printed and nothing will happen.
#
# Finally, if you select a profile that is not currently set, then the
# AWS_PROFILE environment variable will be set and the AWS Account ID
# for the profile will be retrieved. If the Account ID cannot be
# retrieved you will be notified, but the profile will still be
# selected, else a message telling you that you switched to the
# profile will be displayed.
#


function aws-profile() {
    local -a profiles
    local i a profile cmd account
    local aws_creds_file="$HOME/.aws/credentials"

    if [[ ! -f "$aws_creds_file" ]]; then
        echo "AWS credentials file (${aws_creds_file}) not found!"
        return
    fi
    
    mapfile -t profiles < <(grep -oP '(?<=\[).+(?=\])' "$aws_creds_file" | sort)

    for ((i=0; i<${#profiles[@]}; i++)); do
        printf "%02d - %s\n" $((i+1)) "${profiles[$i]}"
    done | column

    echo
    while true; do
        echo -n "Select profile: "
        read -r a
        [[ -z $a ]] || [[ $a -gt 0 && $a -le ${#profiles[@]} ]] && break;
    done

    [[ -z $a ]] && return

    profile=${profiles[$((a-1))]}

    if [[ $AWS_PROFILE == "$profile" ]]; then
        echo "The ${profile} profile is already selected."
        return
    fi

    cmd="AWS_PROFILE=${profile}"
    eval "$cmd"

    echo
    account=$(aws sts get-caller-identity --query "Account" --output text 2>&1) \
        &&  echo "Switched to AWS Profile=${profile}, Account ID=${account}" \
            || echo "Your credentials for ${profile} are invalid!"
    echo
}

This is now part of my AWS CLI Utilities for Bash, i.e., I won't be updating this gist.