ogr - GDAL SQL syntax to add field an put values

I try to make a new field in my attribute table and put in values from another field after converting from character to integer but can't get the right syntax. I run this as shell-script in MSYS.

cd D:/GIS_DataBase/CorineLC/shps_app_and_extr/
myfile=extr_and_app.shp

name=${myfile%.shp}


ogrinfo $myfile -sql "ALTER TABLE $name ADD COLUMN code_num int(3)"
ogrinfo $myfile -sql "UPDATE TABLE $name SET code_num = CONVERT(code_06 As int(3))"

Error Message (MSYS):

Kay@KAY-PC /c/users/kay/desktop/bash
$ sh calc_field_shp.sh
Warning 6: Unsupported column type 'int'. Defaulting to VARCHAR
INFO: Open of `extr_and_app.shp'
      using driver `ESRI Shapefile' successful.
ERROR 1: SQL Expression Parsing Error: syntax error

INFO: Open of `extr_and_app.shp'
      using driver `ESRI Shapefile' successful.

cd D:/GIS_DataBase/CorineLC/shps_app_and_extr/
myfile=extr_and_app.dbf

name=${myfile%.dbf}

ogrinfo $myfile -sql "ALTER TABLE $name DROP COLUMN code_num"


ogrinfo $myfile -sql "ALTER TABLE $name ADD COLUMN code_num integer(3)"
ogrinfo $myfile -dialect SQLite -sql "UPDATE $name SET code_num = CAST(code_06 As integer(3))"

Error message:

Kay@KAY-PC /c/users/kay/desktop/bash
$ sh calc_field_shp.sh
INFO: Open of `extr_and_app.dbf'
      using driver `ESRI Shapefile' successful.
INFO: Open of `extr_and_app.dbf'

      using driver `ESRI Shapefile' successful.
ERROR 1: SQL Expression Parsing Error: syntax error
INFO: Open of `extr_and_app.dbf'
      using driver `ESRI Shapefile' successful.

Answer

Because UPDATE is not supported in OGR SQL, as you stated in a comment, you should update the table using the SQLite SQL dialect available in GDAL >= 1.10 with SQLite and SpatiaLite support:

ogrinfo $myfile -sql "ALTER TABLE $name ADD COLUMN code_num integer(3)"
ogrinfo $myfile -dialect SQLite -sql "UPDATE $name SET code_num = CAST(code_06 AS integer(3))"