title: batch file change bracket speciff my.ini
body: <p>I need to locate a [mysqld] bracket inside a file (my.ini), after it finds 2 variables "lower_case_table_names = 1" and "max_allowed_packet = 512M", if they exist make the necessary change in their values, if there is no write With past values.</p>
  
  <p>I am using this batch file, for this verification however, after the file everything goes wrong, and the variables are written in the first line.</p>
  
  <p>batch file teste.bat</p>
  
  <pre><code>&gt;my.ini.new (
  echo lower_case_table_names=1
  echo max_allowed_packet=512M
  for /f "skip=71 delims=" %%A in (my.ini) do echo %%A
  )
  move /y my.ini.new my.ini &gt;nul
  </code></pre>
  
  <p>file my.ini</p>
  
  <pre><code># MySQL Server Instance Configuration File
  # ----------------------------------------------------------------------
  # Generated by the MySQL Server Instance Configuration Wizard
  #
  #
  # Installation Instructions
  # ----------------------------------------------------------------------
  #
  # On Linux you can copy this file to /etc/my.cnf to set global options,
  # mysql-data-dir/my.cnf to set server-specific options
  # (@localstatedir@ for this installation) or to
  # ~/.my.cnf to set user-specific options.
  #
  # On Windows you should keep this file in the installation directory 
  # of your server (e.g. C:\Program Files\MySQL\MySQL Server X.Y). To
  # make sure the server reads the config file use the startup option 
  # "--defaults-file". 
  #
  # To run run the server from the command line, execute this in a 
  # command line shell, e.g.
  # mysqld --defaults-file="C:\Program Files\MySQL\MySQL Server X.Y\my.ini"
  #
  # To install the server as a Windows service manually, execute this in a 
  # command line shell, e.g.
  # mysqld --install MySQLXY --defaults-file="C:\Program Files\MySQL\MySQL Server X.Y\my.ini"
  #
  # And then execute this in a command line shell to start the server, e.g.
  # net start MySQLXY
  #
  #
  # Guildlines for editing this file
  # ----------------------------------------------------------------------
  #
  # In this file, you can use all long options that the program supports.
  # If you want to know the options a program supports, start the program
  # with the "--help" option.
  #
  # More detailed information about the individual options can also be
  # found in the manual.
  #
  #
  # CLIENT SECTION
  # ----------------------------------------------------------------------
  #
  # The following options will be read by MySQL client applications.
  # Note that only client applications shipped by MySQL are guaranteed
  # to read this section. If you want your own MySQL client program to
  # honor these values, you need to specify it as an option during the
  # MySQL client library initialization.
  #
  [client]
  
  port=3306
  
  [mysql]
  
  default-character-set=latin1
  
  
  # SERVER SECTION
  # ----------------------------------------------------------------------
  #
  # The following options will be read by the MySQL Server. Make sure that
  # you have installed the server correctly (see above) so it reads this 
  # file.
  #
  [mysqld]
  
  # The TCP/IP Port the MySQL Server will listen on
  port=3306
  
  
  #Path to installation directory. All paths are usually resolved relative to this.
  basedir="C:/Program Files (x86)/MySQL/MySQL Server 5.1/"
  
  #Path to the database root
  datadir="C:/ProgramData/MySQL/MySQL Server 5.1/Data/"
  
  # The default character set that will be used when a new schema or table is
  # created and no character set is defined
  character-set-server=latin1
  
  # The default storage engine that will be used when create new tables when
  default-storage-engine=INNODB
  
  # Set the SQL mode to strict
  sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
  
  # The maximum amount of concurrent sessions the MySQL server will
  # allow. One of these connections will be reserved for a user with
  # SUPER privileges to allow the administrator to login even if the
  # connection limit has been reached.
  max_connections=160
  
  # Query cache is used to cache SELECT results and later return them
  # without actual executing the same query once again. Having the query
  # cache enabled may result in significant speed improvements, if your
  # have a lot of identical queries and rarely changing tables. See the
  # "Qcache_lowmem_prunes" status variable to check if the current value
  # is high enough for your load.
  # Note: In case your tables change very often or if your queries are
  # textually different every time, the query cache may result in a
  # slowdown instead of a performance improvement.
  query_cache_size=99M
  
  # The number of open tables for all threads. Increasing this value
  # increases the number of file descriptors that mysqld requires.
  # Therefore you have to make sure to set the amount of open files
  # allowed to at least 4096 in the variable "open-files-limit" in
  # section [mysqld_safe]
  table_cache=320
  
  # Maximum size for internal (in-memory) temporary tables. If a table
  # grows larger than this value, it is automatically converted to disk
  # based table This limitation is for a single table. There can be many
  # of them.
  tmp_table_size=103M
  
  
  # How many threads we should keep in a cache for reuse. When a client
  # disconnects, the client's threads are put in the cache if there aren't
  # more than thread_cache_size threads from before.  This greatly reduces
  # the amount of thread creations needed if you have a lot of new
  # connections. (Normally this doesn't give a notable performance
  # improvement if you have a good thread implementation.)
  thread_cache_size=8
  
  #*** MyISAM Specific options
  
  # The maximum size of the temporary file MySQL is allowed to use while
  # recreating the index (during REPAIR, ALTER TABLE or LOAD DATA INFILE.
  # If the file-size would be bigger than this, the index will be created
  # through the key cache (which is slower).
  myisam_max_sort_file_size=100G
  
  # If the temporary file used for fast index creation would be bigger
  # than using the key cache by the amount specified here, then prefer the
  # key cache method.  This is mainly used to force long character keys in
  # large tables to use the slower key cache method to create the index.
  myisam_sort_buffer_size=167M
  
  # Size of the Key Buffer, used to cache index blocks for MyISAM tables.
  # Do not set it larger than 30% of your available memory, as some memory
  # is also required by the OS to cache rows. Even if you're not using
  # MyISAM tables, you should still set it to 8-64M as it will also be
  # used for internal temporary disk tables.
  key_buffer_size=16M
  
  # Size of the buffer used for doing full table scans of MyISAM tables.
  # Allocated per thread, if a full scan is needed.
  read_buffer_size=64K
  read_rnd_buffer_size=256K
  
  # This buffer is allocated when MySQL needs to rebuild the index in
  # REPAIR, OPTIMZE, ALTER table statements as well as in LOAD DATA INFILE
  # into an empty table. It is allocated per thread so be careful with
  # large settings.
  sort_buffer_size=256K
  
  
  #*** INNODB Specific options ***
  
  
  # Use this option if you have a MySQL server with InnoDB support enabled
  # but you do not plan to use it. This will save memory and disk space
  # and speed up some things.
  #skip-innodb
  
  # Additional memory pool that is used by InnoDB to store metadata
  # information.  If InnoDB requires more memory for this purpose it will
  # start to allocate it from the OS.  As this is fast enough on most
  # recent operating systems, you normally do not need to change this
  # value. SHOW INNODB STATUS will display the current amount used.
  innodb_additional_mem_pool_size=12M
  
  # If set to 1, InnoDB will flush (fsync) the transaction logs to the
  # disk at each commit, which offers full ACID behavior. If you are
  # willing to compromise this safety, and you are running small
  # transactions, you may set this to 0 or 2 to reduce disk I/O to the
  # logs. Value 0 means that the log is only written to the log file and
  # the log file flushed to disk approximately once per second. Value 2
  # means the log is written to the log file at each commit, but the log
  # file is only flushed to disk approximately once per second.
  innodb_flush_log_at_trx_commit=1
  
  # The size of the buffer InnoDB uses for buffering log data. As soon as
  # it is full, InnoDB will have to flush it to disk. As it is flushed
  # once per second anyway, it does not make sense to have it very large
  # (even with long transactions).
  innodb_log_buffer_size=6M
  
  # InnoDB, unlike MyISAM, uses a buffer pool to cache both indexes and
  # row data. The bigger you set this the less disk I/O is needed to
  # access data in tables. On a dedicated database server you may set this
  # parameter up to 80% of the machine physical memory size. Do not set it
  # too large, though, because competition of the physical memory may
  # cause paging in the operating system.  Note that on 32bit systems you
  # might be limited to 2-3.5G of user level memory per process, so do not
  # set it too high.
  innodb_buffer_pool_size=570M
  
  # Size of each log file in a log group. You should set the combined size
  # of log files to about 25%-100% of your buffer pool size to avoid
  # unneeded buffer pool flush activity on log file overwrite. However,
  # note that a larger logfile size will increase the time needed for the
  # recovery process.
  innodb_log_file_size=114M
  
  # Number of threads allowed inside the InnoDB kernel. The optimal value
  # depends highly on the application, hardware as well as the OS
  # scheduler properties. A too high value may lead to thread thrashing.
  innodb_thread_concurrency=10
  </code></pre>