SQL*Loader-128: unable to begin a session ORA-01005: null password given; logon denied

This error related to shell script file.

Error: Username:Password:

            SQL*Loader-128: unable to begin a session

            ORA-01005: null password given; logon denied

Solution: 

            Use $1 parameter  (UID_PWD=$1) in shell script (.prog) file. 

In shell script 1st five parameters are standard.

$0 - Shellscript name

$1 - Oracle username/password

$2 - User_id

$3 - Oracle Applications username

$4 - Concurrent request id

Also from $5, $6 ..... will be the shell script/user defined arguments.