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3_3__Using_Command-Line_Variables.md
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# Interlude: Using Command-Line Variables
> **NOTE:** This is a draft in progress, so that I can get some feedback from early reviewers. It is not yet ready for learning.
The previous section demonstrated a number of command-line commands used without obfuscation or interference. However, that's often not the best way to run Bitcoin from the command line. Because you're dealing with long, complex, and unreadable variables, it's easy to make a mistake if you're copying those variables around (or, satoshi forfend, if you're typing them in by hand). Because those variables can mean the difference between receiving and losing real money, you don't _want_ to make mistakes. For these reasons, we strongly suggest using command-line variables to save addresses, signatures, or other long strings of information whenever it's reasonable to do so.
If you're using `bash`, you can save information to a variable like this: