p-aws.sh

#!/bin/bash
SCRIPTNAME=${0##*/}

# showHelp
#   Show usage text.
function showHelp {
	echo "USAGE:"
	echo " $SCRIPTNAME [OPTIONS]"
	echo " This is a script to control instances on AWS."
	echo
	echo "OPTIONS:"
	echo "     --awsebcli-install   Install pip and awsebcli globally"
	echo "     --awsebcli-upgrade   Upgrade awsebcli python packages"
	echo " -h, --help               Show this help message"
	exit 0
}

# showError
#   Put error text to the standard output stream, and add usage text.
#
#   $1 - Error description.
function showError {
	echo "$SCRIPTNAME: ERROR: $1" >&2
	echo >&2
	showHelp >&2
}

function ebcli_install {
	wget https://bootstrap.pypa.io/get-pip.py -O /tmp/get-pip.py
	sudo -H python /tmp/get-pip.py
	sudo -H pip install awsebcli
	exit 0
}

function ebcli_upgrade {
	sudo -H pip install awsebcli --upgrade
	exit 0
}


# MAIN #########################################################################

# Handling of script arguments...
# Each short option character in shortopts may be followed by one colon to
# indicate it has a required argument, and by two colons to indicate it has
# an optional argument. For example, "hx:" if "h" has no argument, whereas "x"
# has one. Long options are separated by a comma.
ARGS=$(
	getopt -q -o "h" \
	-l "help" \
	-l "awsebcli-install" \
	-l "awsebcli-upgrade" \
	-n $SCRIPTNAME -- "$@"
)

if [ $? != 0 ] ; then
	showError "Wrong argument given: $@"
	exit 1
fi

eval set -- "$ARGS"

CMD=
while true; do
	case "$1" in
		-h | --help)
			showHelp
		;;
		--awsebcli-install)
			ebcli_install
		;;
		--awsebcli-upgrade)
			ebcli_upgrade
		;;
		-- )
			shift
			break
		;;
		*)
		    showError "OPTION '$1' does not exist."
		    exit 1
		;;
	esac
done



# We should never reach this line!
showError "No parameter specified."
exit 1