POSIX sh EBNF grammar

Question

Is there an existing POSIX sh grammar available or do I have to figure it out from the specification directly?

Note I\'m not so much interested in a pure sh

Answer 1

The POSIX standard defines the grammar for the POSIX shell. The definition includes an annotated Yacc grammar. As such, it can be converted to EBNF more or less mechanically.

If you want a 'real' grammar, then you have to look harder. Choose your 'real shell' and find the source and work out what the grammar is from that.

Note that EBNF is not used widely. It is of limited practical value, not least because there are essentially no tools that support it. Therefore, you are unlikely to find an EBNF grammar (of almost anything) off-the-shelf.