This is a good guide for starting off. While I knew all of the flags/options mentioned in the post, that knowledge was gained over time; not reading a single post and emerging the ruler of .

For example, it took me more than a year to know that `grep` could search within files directly. Until then I thought it could only search from STDIN and that I had to `cat file | grep string`.
The count matching too took a while to figure out. I was piping to `wc -l` instead.

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