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  • rui@ruir:~$ b=1 rui@ruir:~$ bash rui@ruir:~$ echo $b (nothing) Commented Feb 11, 2016 at 2:34
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    @RuiFRibeiro: You were confused between child process environment and subshell environment. Commented Feb 11, 2016 at 2:35
  • thanks. In my example,b isn't an environment variable, why is c assigned the value of b by command substituion? Commented Feb 11, 2016 at 2:49
  • I took the liberty of editing the English, and made a word change that I think will help @Tim understand better the issue of his last question. Commented Feb 11, 2016 at 3:00
  • @Rui: Does the reply answer my question in my last comment, which is also in my post? I.e. In my example, b isn't an environment variable, so b doesn't exist in the subshell, why is c assigned the value of b by command substituion? Commented Feb 11, 2016 at 3:20