Executing grep from Ruby

I want to run the following grep from within a Ruby script:

grep "word1" file1.json | grep -c "word2"

This will find the number of lines in the file with both words appearing. I could do this with Ruby regex, but it seems that Unix grep is much faster. So my question is how do I run this command within a script and return the result back to a Ruby variable?

I'd love to hear alternative solutions that don't use grep, if they are as fast or even faster.

---

使用反引号执行shell命令：

result = `grep "word1" file1.json | grep -c "word2"`

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