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Update 09_3_Testing_a_Bitcoin_Script.md

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Some notes and suggestions.
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09_3_Testing_a_Bitcoin_Script.md
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@ -10,10 +10,10 @@ This chapter thus describes a prime method for testing Bitcoin Scripts, which we
The Bitcoin Script Debugger (`btcdeb`) by @kallewoof is one of the most reliable methods we've found for debugging Bitcoin Scripts. It does, however, require setting up C++ and a few other accessories on your machine, so we'll also offer a few other options toward the end of this chapter.
First, you need to clone the `btcdeb` GitHub, which will also require installing `git if you don't yet have it.
First, you need to clone the `btcdeb` GitHub repository, which will also require installing `git` if you don't yet have it.
```
$ sudo apt-get install git
$ git clone https://github.com/kallewoof/btcdeb.git
$ git clone https://github.com/bitcoin-core/btcdeb.git
```
Note that when you run `git clone` it will copy `btcdeb` into your current directory. We've chosen to do so in our `~standup` directory.
```
@ -24,6 +24,10 @@ Afterward, you must install required C++ and other packages.
```
$ sudo apt-get install autoconf libtool g++ pkg-config make
```
You should also install readline, as this makes the debugger a lot easier to use by supporting history using up/down arrows, left-right movement, autocompletion using tab, and other good user interfaces.
```
$ sudo apt-get install libreadline-dev
```
You're now ready to compile and install `btcdeb`:
```
$ cd btcdeb
@ -37,10 +41,6 @@ After all of that, you should have a copy of `btcdeb`:
$ which btcdeb
/usr/local/bin/btcdeb
```
You should also install readline, as this makes the debugger a lot easier to use by supporting history using up/down arrows, left-right movement, autocompletion using tab, and other good user interfaces.
```
$ sudo apt-get install libreadline-dev
```
## Use btcdeb
@ -188,7 +188,7 @@ Using these commands can make it easier to see what's going on and where you are
There are also a few web simulators that you can use to test scripts online. They can be superior to a command-line tool by offering a more graphical output, but we also find that they tend to have shortcomings.
In the past we've tried to give extensive guidelines on using sites such as the [Script Playground](http://www.crmarsh.com/script-playground/) or the [Bitcoin Online Script Debugger](https://bitcoin-script-debugger.visvirial.com/), but they become out of date and/or disappear to quickly to keep up with them.
In the past we've tried to give extensive guidelines on using sites such as the [Script Playground](http://www.crmarsh.com/script-playground/) or the [Bitcoin Online Script Debugger](https://bitcoin-script-debugger.visvirial.com/), but they become out of date and/or disappear too quickly to keep up with them.
Assume that these debuggers have the nice advantage of showing things visually and explicitly telling you whether a script succeeds (unlocks) or fails (stays locked). Assume that they have disadvantages with signatures, where many of them either always return `true` for signature tests or else have very cumbersome mechanisms for incorporating them.