Windows:
mfhco dclgen db=databasename lang=language tbl=schemaname.tablename 
  file=copybookname [pre={USER | TBL | NO}] [user=username] [fld={COL | NUM}]
     null=nullindname [typeint={COMP | COMP5}] [typelob={LOCATOR | LOB | FILE}] 
        [declare={Y | N }] [str=structurename] [id=logon pass=password] 
               		UNIX:
cobmfhco dclgen db=databasename lang=language tbl=schemaname.tablename 
  file=copybookname [pre={USER | TBL | NO}] [user=username] [fld={COL | NUM}]
     null=nullindname [typeint={COMP | COMP5}] [typelob={LOCATOR | LOB | FILE}] 
        [declare={Y | N }] [str=structurename] [id=logon pass=password] 
               	 | databasename | Name of the target database. | 
| language | Language to generate. cbl is the default; can also specify c or pli. | 
| schemaname | Schema name for the generated copybook. | 
| tablename | Table name for the generated copybook. | 
| filename | Name of the copybook file to generate. | 
| TBL | Specifies that the copybook prefix is the same as the table name. Default. | 
| USER | Specifies that the prefix is supplied by the user. | 
| NO | Specifies that there is no prefix. | 
| username | A text string composed of valid COBOL characters, used as a prefix for each host variable in the copybook. | 
| COL | Specifies the column name. Default. | 
| NUM | Specifies the column number. | 
| nullindname | Specifies the null indicator name suffix. Default is NULL. | 
| COMP | Specifies generation of numeric fields as COMP variables. Default. | 
| COMP5 | Specifies generation of numeric fields as COMP-5 variables. | 
| LOCATOR | Specifies generation of LOB variables as SQL TYPE LOB-LOCATOR. Default. | 
| LOB | Specifies generation of LOB variables as SQL TYPE LOB(size). | 
| FILE | Specifies generation of LOB variables as SQL TYPE LOB-FILE. | 
| declare | Y - Generate DECLARE TABLE as part of the copybook. Default. N - Do not generate DECLARE TABLE as part of the copybook. | 
| structurename | Specifies the name of the copybook structure. | 
| logon | The logon ID for the database server. | 
| pass | The password for the database server. | 
Windows:
mfhco dclgen db=db2demo lang=cbl tbl=demo.items file=item.cpy
UNIX:
cobmfhco dclgen db=db2demo lang=cbl tbl=demo.items file=item.cpy