Batch File is an ASCII file with the extension .bat or .cmd containing a series of commands.
What is Batch File
Also called a batch program, an ASCII file with the extension .bat or .cmd containing a series of commands. These commands are executed sequentially when the batch file is invoked at the command prompt or in a logon script. Batch files are used primarily to simplify the execution of routine or repetitive administrative tasks such as mapping drives, synchronizing system clocks, or performing backups.
Batch File example
If you want to control the rate at which directory information is replicated between a backup domain controller (BDC) and a primary domain controller (PDC) on a Windows NT–based network, you can create a batch file that will change the value of the ReplicationGovernor parameter on the BDC. First create a script that has the full path to this parameter in the registry along with the value you want to assign to it, and then create the following simple batch file:
regini <Script_Name>net stop netlogon
net start netlogon
Two different scripts and batch files can be created for different times of the day, and the at command can be used to schedule the execution of each batch file at the appropriate time. This illustration is especially useful if directory replication must occur over a slow WAN link, and it can be used to ensure that most replication traffic occurs during off hours.