Thanks Werner for your suggestion, but what I am wondering is , in the previous versions "--passphrase" option would be used to provide passphrase in the command line and thus prevent prompt to get input from us every time. This helped to automate the encryption process. But now in 3.0.0 regardless of option, it keeps prompting for passphrase.

I mean correct me if there is anything wrong in the command

no it is not

i am sorry what is 8 digit challenger?