osql -b question!

the help document said that

"osql -b will specifies that OSQL exits and returns a DOS ERRORLEVEL value when an error occurs. The value returned to the DOS ERRORLEVEL variable is 1 when the SQL Server error message has a severity of 10 or greater; otherwise, the value returned is 0."

my question is : how can I get the DOS ERRORLEVEL.

example:

C:\>isql -E -b -Q"backup log pubs to disk='C:\adsfasd.tmp'"

the result:

Msg 4208, Level 16, State 0, Server YANG, Line 1
当恢复模型为 SIMPLE 时，不允许使用 BACKUP LOG 语句。请使用 BACKUP DATABASE 或用
ALTER DATABASE
更改恢复模型。
Msg 3013, Level 16, State 1, Server YANG, Line 1
BACKUP LOG 操作异常终止。

It's in chinese language,means
"can not use BACKUP LOG when the restore model being SIMPLE,you can use ALTER DATABASE or BACKUP DATABASE to change the restore model.
Msg 3013, Level 16, State 1, Server YANG, Line 1
BACKUP LOG aborted"

where is DOS ERRORLEVEL?? How can I get it??

thankstake a look at the server errorlog or the backupserver errorlog for details|||See KB#39585 (http://support.microsoft.com/default.aspx?scid=kb;en-us;39585).

-PatP