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+npmrc(5) -- The npm config files
+================================
+
+## DESCRIPTION
+
+npm gets its config settings from the command line, environment
+variables, and `npmrc` files.
+
+The `npm config` command can be used to update and edit the contents
+of the user and global npmrc files.
+
+For a list of available configuration options, see npm-config(7).
+
+## FILES
+
+The three relevant files are:
+
+* per-user config file (~/.npmrc)
+* global config file ($PREFIX/npmrc)
+* npm builtin config file (/path/to/npm/npmrc)
+
+All npm config files are an ini-formatted list of `key = value`
+parameters.  Environment variables can be replaced using
+`${VARIABLE_NAME}`. For example:
+
+    prefix = ${HOME}/.npm-packages
+
+Each of these files is loaded, and config options are resolved in
+priority order.  For example, a setting in the userconfig file would
+override the setting in the globalconfig file.
+
+### Per-user config file
+
+`$HOME/.npmrc` (or the `userconfig` param, if set in the environment
+or on the command line)
+
+### Global config file
+
+`$PREFIX/etc/npmrc` (or the `globalconfig` param, if set above):
+This file is an ini-file formatted list of `key = value` parameters.
+Environment variables can be replaced as above.
+
+### Built-in config file
+
+`path/to/npm/itself/npmrc`
+
+This is an unchangeable "builtin" configuration file that npm keeps
+consistent across updates.  Set fields in here using the `./configure`
+script that comes with npm.  This is primarily for distribution
+maintainers to override default configs in a standard and consistent
+manner.
+
+## SEE ALSO
+
+* npm-folders(5)
+* npm-config(1)
+* npm-config(7)
+* package.json(5)
+* npm(1)