Is Egyptian Arabic a written language?
Hello everyone! Maybe a stupid question. But I am wondering if the Arabic dialects, like Egyptian is also a written language? I understand that MSA is mainly used written. But, for example, if a Egyptian buy a book from a bookshop in Egypt, will this book always be in MSA or sometimes in Egyptian dialect?

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Nooooo, you might find some books intentionally written in Egyptian dialect but journals and all formal papers are written in MSA.
Yes, people write daily messages in their dialect. Some poets write poems in Egyptians dialect too.
GOOD LUCK

P.S. your question is not stupid

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yes, it's a written language here in Egypt, but this is a little in a comparison with MSA,  we have some novels, poems and funny books are written in Egyptian dialect .

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We have here in Egypt some books written in the Egyptian dialect, some articles and some sites but most of the books, sites and articles are written in classical Arabic. There are books such as Ayza Atgouz (novel)

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More than 99% of printed books in Egypt and all Arabic countries are in MSA.

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we have some novels, poems and funny books are written in Egyptian dialect . Like The Blue Elephant, Diamond dust.