I still remember when the computers entered to our Department during the early 90s, the local computer technician used to install Windows operating system as and when required and used to charge an amount of Rs 250 per installation. He was dare enough to give a bill with description that “installation of Windows” The OS CD supplied along with computer was somewhere in the cupboard and we were not aware of the CD supplied was a licensed version. The guy always used the pirated CD!
One of the DOS program which was the main program used then was opening in the directory in which it was installed and not opening in any other directory we wanted. Then we had to beg him for the remedy. He was doing something to make that DOS software functioning in any directory.
It took me a few months to detect what exactly he was doing. He was creating one bat file or precisely saying, he was editing the Autoexec.bat file. But he never revealed the secret he was doing.
What is Bat or Batch file?
In DOS and Windows, batch file is the name given to a type of script file, a text file with filename extension .bat containing a series of commands to be executed by the command interpreter.
Batch files are used to ease the work required for certain regular tasks by allowing the user to set up a script to automate them. When a batch file is run, the shell program (usually COMMAND.COM or cmd.exe) reads the file and executes its commands, normally line-by-line.
