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So you want to modify the text of a PDF by hand...

If you, like me, resent every dollar spent on commercial PDF tools, you might want to know how to change the text content of a PDF without having to pay for Adobe Acrobat or another PDF tool. I didn't see an obvious open-source tool that lets you dig into PDF internals, but I did discover a few useful facts about how PDFs are structured that I think may prove useful to others (or myself) in the future. They are recorded here. They are surely not universally applicable --
the PDF standard is truly Byzantine -- but they worked for my case.

	#!/usr/bin/env sh

	: ${TARGETPLATFORM=}
	: ${TARGETOS=}
	: ${TARGETARCH=}
	: ${TARGETVARIANT=}

	: ${OUT_ARCH=}
	: ${DPKG_ARCH=}
	: ${PKG_PREFIX=}

	# Bash best practices and style-guide

	Just simple methods to keep the code clean.

	Inspired by [progrium/bashstyle](https://github.com/progrium/bashstyle) and [Kfir Lavi post](http://www.kfirlavi.com/blog/2012/11/14/defensive-bash-programming/).


	## Quick big rules
	* All code goes in a function
	* Always double quote variables

	docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
	docker buildx create --name multiarch --driver docker-container --use
	docker buildx inspect --bootstrap