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See also: [[write18Write18]]
== How to pass over part of the source to an external program? ==
I do not know what is the best source of their documenentation.
{{cmd|write}} is explained in the TeXbook, [[write18Write18]] executes its argument on shell.
luatex will have a better model for executing commands on the shell, and some
of it is explained in the luatex manual. (But luatex is still pre-alpha, so
I found ConTeXt sources to be the best way to understand how these things are
working. See [[modules:t-lilypond|t-lilypond]], which checks if [[write18Write18]] is enabled or not, and then
uses {{cmd|executesystemcommand}} or {{cmd|installprogram}}:
