How to retrieve a variable in UNIX

I am on Unix and I have a small problem:

In sh-mode console, I enter a variable with read and everything works well, I can retrieve it with echo, but in vim, it does not work. When running this script, read the works and I can enter a value, but as soon as this happens a echo, it makes me a line empty. My code:

Code:

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#!/bin/sh

  echo return a value
  read $ val
  echo value is:
  echo $ val

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Must be

Code:

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read val

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without "$" to val.

Perfect, so good.

So another question. Could you explain the mechanism of $ read in the console and not to save for under $ vim.

If I am not mistaken, the $ in the console is required to declare the variable, right?

It happens exactly the same way in the console:
Proof:

Code:

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  cedrx @ linux: ~ $ read val
  25
  cedr @ linux: ~ $ echo $ val
  25

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You absolutely right, I just try it in the shell sh and it's good too. In fact I'm in the csh under the console. I'd load because the result is programming in C under Linux. I apologize for my ignorance, but it is not easy to take courses by correspondence after all these years .

In any case I would like to greatly thank you, it's very nice of your part.