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# Release 1.6 (2013-09-10)
In addition to the usual bug fixes, this release has several new
features:
- The command `nix-build --run-env` has been renamed to `nix-shell`.
- `nix-shell` now sources `$stdenv/setup` *inside* the interactive
shell, rather than in a parent shell. This ensures that shell
functions defined by `stdenv` can be used in the interactive shell.
- `nix-shell` has a new flag `--pure` to clear the environment, so you
get an environment that more closely corresponds to the “real” Nix
build.
- `nix-shell` now sets the shell prompt (`PS1`) to ensure that Nix
shells are distinguishable from your regular shells.
- `nix-env` no longer requires a `*` argument to match all packages,
so `nix-env -qa` is equivalent to `nix-env
-qa '*'`.
- `nix-env -i` has a new flag `--remove-all` (`-r`) to remove all
previous packages from the profile. This makes it easier to do
declarative package management similar to NixOS’s
`environment.systemPackages`. For instance, if you have a
specification `my-packages.nix` like this:
with import <nixpkgs> {};
[ thunderbird
geeqie
...
]
then after any change to this file, you can run:
$ nix-env -f my-packages.nix -ir
to update your profile to match the specification.
- The ‘`with`’ language construct is now more lazy. It only evaluates
its argument if a variable might actually refer to an attribute in
the argument. For instance, this now works:
let
pkgs = with pkgs; { foo = "old"; bar = foo; } // overrides;
overrides = { foo = "new"; };
in pkgs.bar
This evaluates to `"new"`, while previously it gave an “infinite
recursion” error.
- Nix now has proper integer arithmetic operators. For instance, you
can write `x + y` instead of `builtins.add x y`, or `x <
y` instead of `builtins.lessThan x y`. The comparison operators also
work on strings.
- On 64-bit systems, Nix integers are now 64 bits rather than 32 bits.
- When using the Nix daemon, the `nix-daemon` worker process now runs
on the same CPU as the client, on systems that support setting CPU
affinity. This gives a significant speedup on some systems.
- If a stack overflow occurs in the Nix evaluator, you now get a
proper error message (rather than “Segmentation fault”) on some
systems.
- In addition to directories, you can now bind-mount regular files in
chroots through the (now misnamed) option `build-chroot-dirs`.
This release has contributions from Domen Kožar, Eelco Dolstra, Florian
Friesdorf, Gergely Risko, Ivan Kozik, Ludovic Courtès and Shea Levy.
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