by the contents of file. It is useful if files included with .so need to be preprocessed. Normally, soelim should be invoked with the -s option of groff.
To embed '\' in the file name, write '\\' or '\e'. To embed a space, write '\ '. Any other escape sequence in file makes soelim ignore the whole line.
input sourced file file | | v v preprocessor -> troff -> postprocessor | v output file
That is, files sourced with .so are normally read only by troff (the actual formatter). soelim is not required for troff to source files.
If a file to be sourced should also be preprocessed, it must already be read before the input file passes through the preprocessor. This is handled by soelim:
input file | v soelim -> preprocessor -> troff -> postprocessor ^ | | v sourced output file file
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