Difference between NLS_LANG and LANG

Hi all,
May i know the difference between NLS_LANG and LANG? Currently they are set as NLS_LANG=american.america.WE8ISO8859P1 and LANG=c as my environment variables. Will it post any problem for the future usage of Oracle? Thanks.

AFAIK, LANG is not related to Oracle. For an explanation of NLS_LANG, see MOS Doc 158577.1 (NLS_LANG Explained (How does Client-Server Character Conversion Work?))
HTH
Srini

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