This custom search only searches dedicated Linux websites:
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Google used to have a custom search for Linux (aka GNU/Linux) at google.com/linux
but they discontinued it on the basis that it's normally enough to add linux
as a search term. However, this custom search is useful:
- if you want to avoid spammy search results
- when searching for a rarely used term such as a model number - such searches often give hits which mention merely Linux in a sidebar or footer etc, but where the page itself is are not actually about Linux.
By narrowing the search down to only Linux-specific websites, these problems are avoided.