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IF is a conditional statement, that allows branching of the program execution. It evaluates the specified condition, and only if it is true, then it executes the remainder of the command line. Otherwise, it skips the remainder of the line and continues with next command line. Used in Batch files. The command is available in MS-DOS versions 2 ...
Microsoft released a version of cmd.exe for Windows 9x and ME called WIN95CMD to allow users of older versions of Windows to use certain cmd.exe-style batch files. As of Windows 8, cmd.exe is the normal command interpreter for batch files; the older COMMAND.COM can be run as well in 32-bit versions of Windows able to run 16-bit programs.
The Call command in COMMAND.COM only supports calling external batch files. File name parser extensions to the Set command are comparable with C shell. [further explanation needed] The Set command can perform expression evaluation. An expansion of the For command supports parsing files and arbitrary sets in addition to file names.
COMMAND.COM's successor on OS/2 and Windows NT systems is cmd.exe, although COMMAND.COM is available in virtual DOS machines on IA-32 versions of those operating systems as well. The COMMAND.COM filename was also used by Disk Control Program (DCP), an MS-DOS derivative by the former East German VEB Robotron. [2] COMMAND.COM is a DOS program.
One can use these mechanisms to write specific command processors for dedicated uses, and process external data files which reside in batch files. Many graphical interfaces, such as the OS/2 Presentation Manager and early versions of Microsoft Windows use command lines to call helper programs to open documents and programs.
The command specifier supports some special syntax options. It can be used directly on the command line , or in batch files or other scripts . The forfiles command was originally provided as an add-on, in the Windows 98 , [ 1 ] Windows NT [ citation needed ] and Windows 2000 [ 2 ] Resource Kits .
Under OS/2 and Windows NT, the .CMD file extension is associated with batch scripts for their command processor CMD.EXE.Since binary code will not be executed this way, attempting to run CP/M-86 CMD files under the CMD command processor will not work, but typically only cause mild inconvenience to users.
In computing, start is a command of the IBM OS/2, [1] Microsoft Windows [2] and ReactOS [3] command-line interpreter cmd.exe [4] (and some versions of COMMAND.COM) to start programs or batch files or to open files or directories using the default program. start is not available as a standalone program. The underlying Win32 API is ShellExecute.