The help entry for filter explains what the idea is and gives some examples of filters like sort and indent, but does not list the possibilities.
How can I find out all the possible filters?
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consider every program that reads stdin and writes stdout a filter. What is available is out of scope of vim. It largely depends on your OS and installation. The sort of the example in the vim-docu is not part of vim. Besides, it is a bad example, since quite a while vim has inbuild-sort.
sed, perl, python, node, cat, tail, less .... are all valid filters
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Ok, so "filter" just means any shell command that accepts from standard input? If that is true, it is not clear from the help file. – Tyler Durden Jan 14 '18 at 16:06
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1@TylerDurden The Art of Unix Programming has some more detailed description/explanations of "filters" (e.g. here and here). The book is worth reading in its entirety for any programmer, IMHO (not just Unixprogrammers). – Martin Tournoij♦ Jan 16 '18 at 18:03
