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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 `$NIX_CONF_DIR/nix.conf` if
`NIX_CONF_DIR` is set. Values loaded in this file are not forwarded
to the Nix daemon. The client assumes that the daemon has already
loaded them.
- If `NIX_USER_CONF_FILES` is set, then each path separated by `:`
will be loaded in reverse order.
Otherwise it will look for `nix/nix.conf` files in `XDG_CONFIG_DIRS`
and `XDG_CONFIG_HOME`. If these are unset, it will look in
`$HOME/.config/nix.conf`.
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`.
The following settings are currently available:
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