it's somewhere used for special search (chars like - to exclude, +to add and 10..20 to specify a range)
to avoid spammers to get email addresses (characters like @ or .) in my experience, it's even impossible to escape special characters. the only solution I found, by now, is using yahoo http://it.search.yahoo.com/
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更新：此答案从 2017 年起不再适用。请参阅 https://blog.google/products/search/improvements-searching-special-characters-programming-languages/
Google 从查询中删除了大部分标点符号，如此处，因此它无法帮助您了解 bash 语法。
在 bash 文档中搜索字符串“##”非常容易：只需运行“info bash”，点击“s”，然后输入“##”作为搜索字符串。
Update: this answer is no longer applicable as of 2017. See https://blog.google/products/search/improvements-searching-special-characters-programming-languages/
Google strips most punctuation from queries, as described here, so it won't help you with the bash syntax.
It's very easy to search for the string "##" in the bash documentation: Just run "info bash", hit "s", and enter "##" as the search string.
谷歌删除标点符号，恕我直言，因为：
根据我的经验，甚至不可能逃避特殊字符。
到目前为止，我找到的唯一解决方案是使用 yahoo http://it.search.yahoo.com/< /a>
google strips puntuation, imho, because:
in my experience, it's even impossible to escape special characters.
the only solution I found, by now, is using yahoo http://it.search.yahoo.com/