Shell script to obtain AWS access and secret key credentials. This script isn't designed to be used on its own (though it's a great self-contained tester for checking your setup) but rather incorporated into a larger script, which then makes use of the credentials to access AWS resources.

aws-getkeys.sh

#!/bin/sh
# Shell script to obtain AWS access and secret key credentials.
# Written by Greg Waterhouse, 2013-05-23.

# Copyright 2013 Greg Waterhouse
# 
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
# 
#      http://www.apache.org/licenses/LICENSE-2.0
# 
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.

if [ -f "${AWS_CONFIG_FILE}" ]; then
  AWS_KEY=`grep aws_access_key_id "$AWS_CONFIG_FILE" | awk '{split($0,a,"="); print a[2]}'`
  AWS_SECRET=`grep aws_secret_access_key "$AWS_CONFIG_FILE" | awk '{split($0,a,"="); print a[2]}'`
else
  AWS_KEY=${AWS_ACCESS_KEY_ID="UNSET"}
  AWS_SECRET=${AWS_SECRET_KEY="UNSET"}
fi
if [ ${AWS_KEY} = "UNSET" ]; then
  echo "${0##*/}: error: Amazon AWS access key not found."; exit 1
fi
if [ ${AWS_SECRET} = "UNSET" ]; then
  echo "${0##*/}: error: Amazon AWS secret key not found."; exit 1
fi

echo "${0##*/}: \c"
echo "Using AWS access key \"${AWS_KEY}\" and secret key \"${AWS_SECRET}\".\n"