#### b.1) How to use the output of one command as the input to another with a pipe...
A special kind of redirection is called a pipe and is denoted by `|`.
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| Command | Description |
|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------|
| `|` | Output from one command line program can be used as input to another one (e.g. `ls *.md | head` gives you the first 5 `*.md` files in your directory) |
-| | |
-* Combining single-purpose filters with pipes is the most productive way to use the shell...
- * a program conforms that to Unix conventions, it can easily be combined with others...
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Example: