[Nix-dev] nix-shell dropping into a shell without anything new

[Ramakrishnan Muthukrishnan]

Hi,

Sorry for the badly worded subject line. 

NixOS newbie here. Playing with NixOS on a VirtualBox installation and
really really liking it so far.

I am using nix-shell and the quick start example in the manual (step #6
listed here: <https://nixos.org/nix/manual/>) does not seem to work for
me:

[ram at nixos:~] nix-shell -p hello
these paths will be fetched (0.04 MiB ...

*** Downloading ....

[ram at nixos:~]$ hello
The program `hello' is currently not installed ...
...
[ram at nixos:~]$ exit

[ram at nixos:~]$

Note that the prompt string didn't change when we entered the nix-shell. 

If I do:

[ram at nixos:~]$ nix-shell -p hello --pure

[nix-shell:~]$ hello
Hello, world!

[nix-shell:~]$

I wonder why without "--pure" it didn't get into the shell. Would
appreciate any help.

thanks
-- 
  Ramakrishnan
  "Err and err and err again, but less and less and less" ⟶ Piet Hein