For your information and for the rest of the community, I used this command line in the dos file:
sqlplus.exe SIEBEL/ mypass@mydb @D:\App\Siebel\EIM\sql\my_sql_command.sql
and output:
SQL*Plus: Release 11.2.0.1.0 Production on Mar. Sept. 13 11:53:52 2016 Copyright (c) 1982, 2010, Oracle. All rights reserved. ERROR: ORA-12154: TNS : .....
in fact, I had a command line error ....
sqlplus.exe SIEBEL/ mypass@mydb **%** @D:\App\Siebel\EIM\sql\my_sql_command.sql
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