Usage:
Start by building the container
$ podman build -t m4container -f container.src
Then run it, as needed
$ sh startcontainer.sh
the examples directory contains a couple of m4 examples
The examples and annotations are retrieved from a couple of articles that were published in Linux Magazine in 2005.
More m4 notes can be found here
The reasonining of the limitations mentioned in examples/diverting.md are better explained here
M4 as it was defined by K&R can been inspected in docs/m4.pdf