echo prints newline instead of \n
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ArchdukeTim commented
Because the command to write to revision.tex uses the non-builtin version of echo, the \n is escaped to a newline character. My solution would be to use printf i.e printf '\newcommand...{%s}' '$(REVISION)' > revision.tex, though there might be a better way.
I'm using zsh on macOS big sur