Hi,

I have come across a scenario where test command resulted wrong result than
expected.

Please follow the below steps to simulate the scenario.
1. Define a variable to blank/null
     export a=
2. Test the parameter with test command on file exists
     test -f $a
3. Echo the result of the last executed command
    echo $?

Result we get is "0" -success, whereas the test command (step 2) should
error with parameter expected after " test -f".

-- 
Regards,
Mathi.C