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# Name
`nix.conf` - Nix configuration file
# Description
By default Nix reads settings from the following places:
- The system-wide configuration file `sysconfdir/nix/nix.conf` (i.e.
`/etc/nix/nix.conf` on most systems), or `$NIX_CONF_DIR/nix.conf` if
`NIX_CONF_DIR` is set. Values loaded in this file are not forwarded
to the Nix daemon. The client assumes that the daemon has already
loaded them.
- If `NIX_USER_CONF_FILES` is set, then each path separated by `:`
will be loaded in reverse order.
Otherwise it will look for `nix/nix.conf` files in `XDG_CONFIG_DIRS`
and `XDG_CONFIG_HOME`. If unset, `XDG_CONFIG_DIRS` defaults to
`/etc/xdg`, and `XDG_CONFIG_HOME` defaults to `$HOME/.config`
as per [XDG Base Directory Specification](https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html).
- If `NIX_CONFIG` is set, its contents is treated as the contents of
a configuration file.
The configuration files consist of `name = value` pairs, one per
line. Other files can be included with a line like `include path`,
where *path* is interpreted relative to the current conf file and a
missing file is an error unless `!include` is used instead. Comments
start with a `#` character. Here is an example configuration file:
keep-outputs = true # Nice for developers
keep-derivations = true # Idem
You can override settings on the command line using the `--option`
flag, e.g. `--option keep-outputs false`. Every configuration setting
also has a corresponding command line flag, e.g. `--max-jobs 16`; for
Boolean settings, there are two flags to enable or disable the setting
(e.g. `--keep-failed` and `--no-keep-failed`).
A configuration setting usually overrides any previous value. However,
you can prefix the name of the setting by `extra-` to *append* to the
previous value. For instance,
substituters = a b
extra-substituters = c d
defines the `substituters` setting to be `a b c d`. This is also
available as a command line flag (e.g. `--extra-substituters`).
The following settings are currently available:
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