skelly -s /path-to-ossuary/a-language/skelenton \
input_a=123 input_b=456 input_N=789
# render a snippet to a file
skelly -f /path-to-ossuary/a-language/snippets/a_snippets \
input_a=123 input_b=456 input_N=789 \
> a_file
# append a snippet to a file
skelly -f /path-to-ossuary/a-language/snippets/a_snippets \
input_a=123 input_b=456 input_N=789 \
>> file_to_append