Spaces in Directory Names

Is putting a space in a directory name still a big deal? I've been doing some reading, but all the articles are from the early 2000s. Is it a problem now?

For those who don't get what I mean: public_html/space directory/index.html

If this is still an issue, why shouldn't I use space开发者_运维知识库s when naming files and directories?

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Spaces in URLs are still special characters that need to be escaped or encoded (either a + or %20).

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Well, I am still crossing fingers when executing external processes (from ant or Java's ProcessBuilder for example). If you just pass this dir to the external process within the command - it may break apart in two arguments which is clearly not what you want.

Some quoting and minding the spaces is still required in some usecases.