Using Unix Variable in a PL/SQL block

Hi,
I have a unix varaible called as account which hold values which i want to use in a PL/SQL block in a shell script.
This variable value is being used in multiple places in the PL/SQL block and i get an erroe whenenevr is use this varaible with $prompt.
Help Urgently

Hi
You need to use a single quote on the variable as shown in the example 2 here: connect to sqlplus from shell

Guru.