ENV Tips

%ENV, when not execute thru CGI, contains the current environnement :

USERNAME                                          the user name used to log.
PROMPT                                                the prompt (ex : $p$g).
PROCESSOR_IDENTIFIER                  a string with information on your CPU
                                                               (ex : x86 Family 5 Model 2 Stepping 12, GenuineIntel).
PROCESSOR_ARCHITECTURE          indicate the family of your CPU (ex : x86).
                                                               OSa string with the name of the OS (ex : Windows_NT).
HOMEDRIVE                                         letter of the home drive (ex : C:).
INCLUDE                                               path of the include.
CPU                                                        kind of CPU (ex : i386).
SYSTEMROOT                                      the place of windows (ex : c:\WINNT).
COMSPEC                                             the place of command interpreter
                                                               (ex : c:\WINNT\system32\cmd32.exe)
PATH                                                       the path ...
PROCESSOR_REVISION                     is your pentium buggy ?
USERPROFILE                                       path of the profile for the current user.
COMPUTERNAME                                name of the computer (ex : UC651)
HOMEPATH                                            your place (ex : /users/bill)
USERDOMAIN                                       name of the domain you logged in.
PROCESSOR_LEVE    L                        level of CPU in its family.
OS2LIBPATH                                          path for OS2 library.
SYSTEMDRIVE                                      letter of the system drive.

Example
foreach $i (keys %ENV) {
    print "$i : $ENV{$i} \n";
}