m4
Oct 13, 2022
https://www.gnu.org/software/m4/manual/m4.html https://ericscrivner.me/2018/07/m4-as-a-basic-templating-system/
The only widely-available tool on unix systems, but it's a pretty insane tool that doesn't fit with modern sensibilities.
I wish the unix ecosystem were upgrading tools like this more rapidly.