(emacs.info) Environment

 
 Environment Variables
 =====================
 
    This appendix describes how Emacs uses environment variables.  An
 environment variable is a string passed from the operating system to
 Emacs, and the collection of environment variables is known as the
 environment.  Environment variable names are case sensitive and it is
 conventional to use upper case letters only.
 
    Because environment variables come from the operating system there
 is no general way to set them; it depends on the operating system and
 especially the shell that you are using.  For example, here's how to set
 the environment variable `ORGANIZATION' to `not very much' using bash:
 
      export ORGANIZATION="not very much"
 
 and here's how to do it in csh or tcsh:
 
      setenv ORGANIZATION "not very much"
 
    When Emacs is set-up to use the X windowing system, it inherits the
 use of a large number of environment variables from the X library.  See
 the X documentation for more information.
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