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The proposed POSIX.2 standard also specifies the {{confstr()}} function which can then be used to look up default values for environment variables. POSIX.1-2008 \[[Austin Group 08|AA. C References#Austin Group 08]\] defines a new {{\_CS_V7_ENV}} argument to {{confstr()}} to retrieve a list of environment variable settings required for a default conforming environment \[[Austin Group 08|AA. C References#Austin Group 08]\]. A space-separated list of variable=value pairs is returned, with variable names guaranteed not to contain = signs, and variable=value pairs guaranteed not to contain spaces. Used together with the {{\_CS_PATH}} request illustrated above, this completely describes the minimum environment variable settings required to obtain a clean conforming environment. On systems conforming to the POSIX.1-2008 standard, this should be used to create a sanitized environment.