Enumerate all schemes in a project, archive them, and export as IPAs.

build.sh

#!/bin/bash

# Builds all targets and places IPAs in build/

# Constants
SIGNING_IDENTITY="iPhone Distribution: Detroit Labs, LLC"

# Get a list of all schemes, then build each.
xcodebuild -project PROJECT.xcodeproj -list | \
	sed -n '/Schemes/,/^$/p' | \
	grep -v "Schemes:" | \
	while read scheme; do
		echo "Building ${scheme}…"

		build_dir="$(pwd)/build"
		archivePath="${build_dir}/Archives/${scheme}.xcarchive"
		exportPath="${build_dir}/${scheme}.ipa"

		xcodebuild -project PROJECT.xcodeproj \
			-scheme "${scheme}" \
			-configuration Release \
			-sdk iphoneos \
			archive \
			-archivePath "${archivePath}" || exit $?

		xcodebuild -exportArchive \
			-exportFormat IPA \
			-archivePath "${archivePath}" \
			-exportPath "${exportPath}" \
			-exportSigningIdentity "${SIGNING_IDENTITY}" || exit $?
	done