FULL PRODUCT VERSION :
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.3.9600]

A DESCRIPTION OF THE PROBLEM :
In Nashorn shell scripting, the variable $ENV.PWD contains the current working directory, that is used when executing commands. However, initially, $ENV.PWD is undefined.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Save the script below to a file "test.js" and run "jjs -scripting test.js" from the command-line.

print($ENV.PWD);
$ENV.PWD = "C:\\Users";
print($ENV.PWD);


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
2 lines are printed: the first is the directory where you saved the script, the second is "C:\Users"
ACTUAL -
2 lines are printed: the first is "undefined", the second is "C:\Users"

REPRODUCIBILITY :
This bug can be reproduced always.