question

[Liu Yushu]

Sir,
  
I have download cygnus b19.1 and install it according to its installation command, but when I use set ${variable} to set variable and use echo ${variable} to watch the variable, it display nothing. However, when I use set &{variable}=value, it will work, is the latter the right way to set variables.Thank you.
  
Best Regards.
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