2.6.13 Loading the files specified in the ENV shell variable
You can use the KSH_ENV_READ environment setting parameter to specify whether the .env files specified in the ENV environment variable are to be loaded when the job controller starts. If this parameter is omitted, the default value depends on the OS, as shown in the following:
Linux and Windows: YES (loads ENV files)
AIX, HP-UX, and Solaris: NO (does not load ENV files)