support/printenv

   1 #! /bin/sh -
   2
   3 if [ $# -eq 0 ]; then
   4         env
   5         exit
   6 elif eval [ "\${$1-unset}" = "unset" ]; then
   7         exit 1
   8 else
   9         eval echo \$$1
  10         exit 0
  11 fi