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The tilde address operator is an extension of GNU sed. It won't work with POSIX sed.
find -exec is evil since it launches a process for each file. You get the total as a bonus.
Also, without -n sort will sort by lexical order (that is 9 after 10).
I took java to make the find command simpler and to state that it works for any language supported by cpp.
cpp is the C/C++ preprocessor (interprets macros, removes comments, inserts includes, resolves trigraphs). The -fpreprocessor option tells cpp to assume the input has already been preprocessed so it will only replace comment lines with blank lines.
The -L 1 option tells xargs to launch one process for each line, indeed cpp can only process one file at the time...
This will only work on files since ls won't tell the size of a directory contents.
Note that the first switch is the digit one, not the letter ell.