Environment example


 $ /usr/bin/printenv EDITOR
 vi

 $ cat envexample
 #!/bin/sh
 echo "EDITOR is $EDITOR"

 export EDITOR=emacs
 
 echo "EDITOR is $EDITOR"
  
 $ ./envexample
 EDITOR is vi
 EDITOR is emacs
 
 $ /usr/bin/printenv EDITOR
 vi