It is possible to have whitespace between the -I command line option and its parameter.
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.
Note that there must be no whitespace between the leading dot and the two characters 's' and 'o'. Otherwise, only groff interprets the .so request (and soelim ignores it).
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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