curl cheat.sh – answer to any question in any language on any programming lang (github.com)

Most important things:

    curl cht.sh/:help
    curl cht.sh/language/question for question about language
    ?Q to switch comments off
    ?T to switch syntax highlighting off
    append /1 for the next question

Special client:

    cht.sh

It supports tab completion, and so on.

You can find more examples on the project page:

https://github.com/chubin/cheat.sh

Vim integration: https://github.com/dbeniamine/cheat.sh-vim is very cool, you can make the queries (and access the results) directly from Vim.

Alternatives:

    howdoi (need to be installed to be used; uses google and stackoverflow)
    how2 (the same)

Cheat sheets tools:

    cheat (not cheat.sh; it is another project)
    tldr (need to be installed).

cheat.sh provides access both to the cheat sheets and to programming language answers.