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# Environment Variables
To use Lix, some environment variables should be set. In particular,
`PATH` should contain the directories `prefix/bin` and
`~/.nix-profile/bin`. The first directory contains the Nix tools
themselves, while `~/.nix-profile` is a symbolic link to the current
*user environment* (an automatically generated package consisting of
symlinks to installed packages). The simplest way to set the required
environment variables is to include the file
`prefix/etc/profile.d/nix.sh` in your `~/.profile` (or similar), like
this:
```bash
source prefix/etc/profile.d/nix.sh
```
# `NIX_SSL_CERT_FILE`
<div class="warning">
FIXME(Lix): This section is undoubtedly wrong due to the Lix installer being replaced. The definitely-wrong install section has been commented out.
</div>
If you need to specify a custom certificate bundle to account for an
HTTPS-intercepting man in the middle proxy, you must specify the path to
the certificate bundle in the environment variable `NIX_SSL_CERT_FILE`.
If you don't specify a `NIX_SSL_CERT_FILE` manually, Lix will install
and use its own certificate bundle.
<!--
Set the environment variable and install Lix
```console
$ export NIX_SSL_CERT_FILE=/etc/ssl/my-certificate-bundle.crt
$ curl -L https://nixos.org/nix/install | sh
```
-->
In the shell profile and rc files (for example, `/etc/bashrc`,
`/etc/zshrc`), add the following line:
```bash
export NIX_SSL_CERT_FILE=/etc/ssl/my-certificate-bundle.crt
```
> **Note**
>
> You must not add the export and then do the install, as the Lix
> installer will detect the presence of Nix configuration, and abort.
If you use the Lix daemon, you should also add the following to
`/etc/nix/nix.conf`:
```
ssl-cert-file = /etc/ssl/my-certificate-bundle.crt
```
## Proxy Environment Variables
The Lix installer has special handling for these proxy-related
environment variables: `http_proxy`, `https_proxy`, `ftp_proxy`,
`no_proxy`, `HTTP_PROXY`, `HTTPS_PROXY`, `FTP_PROXY`, `NO_PROXY`.
If any of these variables are set when running the Lix installer, then
the installer will create an override file at
`/etc/systemd/system/nix-daemon.service.d/override.conf` so `nix-daemon`
will use them.
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