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nix3-repl:tldr:ca042

nix3-repl: Build a package from an expression.
$ :b ${expression}
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The command :b ${expression} is generally used in scripting or programming languages and it serves as a marker or label for a particular section of code.

In this case, ":b" is the label or marker and "${expression}" is the expression or identifier associated with it. The expression can be any valid variable or value used to identify a specific point in the code.

This command can be useful when you need to refer to a specific section of code later on, for example, when using control flow statements like conditional statements or loops. By labeling a section with :b, you can easily refer back to it without having to write the entire block of code again.

Here's an example in a pseudo-code format:

:b start
   // code block
   // ...
   if condition:
      // code block
      // ...
      goto :b start  // jump back to the ":b start" label
   else:
      // code block
      // ...

In this example, when the condition is met, the program will go back to the ":b start" label and reexecute the code block from the beginning. This can be useful for creating loops or repeating certain sections of code based on certain conditions.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.
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