amazon-ec2 install the script ec2sh but running it this tells me this script is deprecated and I should use awshell instead. But this script is NOT installed in my path. I can find the script as /usr/lib64/ruby/gems/1.8/gems/amazon-ec2-0.9.17/bin/awshell and it seems to work if running from there. this is related to the 0.9.17 version.
Thanks for the report. This is now fixed in amazon-ec2-0.9.17-r1.