Index | Notes | Examples
Implemented | SHELL


Starts a new instance of the MS-DOS command interpreter. A command interpreter is a program that lets you type commands. Use the EXIT command to stop the new command interpreter and return control to the old one. Syntax COMMAND [[drive:]path] [device] [/E:nnnnn] [/Y [/C command|/K command]] In your CONFIG.SYS file, use the following syntax: SHELL=[[dos-drive:]dos-path]COMMAND.COM [[drive:]path][device] [/E:nnnn] [/P [/MSG]] Parameters [drive:]path Specifies the directory in which the command interpreter is to look for the COMMAND.COM file when the transient part of the program needs to be reloaded. This parameter must be included when loading COMMAND.COM for the first time if the COMMAND.COM file is not located in the root directory. This parameter is used to set the COMSPEC environment variable. For more information, see Transient and Resident Memory in <COMMAND--Notes>. device Specifies a different device for command input and output. For more information about this parameter, see the <CTTY> command. [dos-drive:]dos-path Specifies the location of the COMMAND.COM file. Switches /C command Specifies that the command interpreter is to perform the specified command and then exit. This switch must be the last switch on the command line. /E:nnnnn Specifies the environment size, where nnnnn is the size in bytes. The value of nnnnn must be in the range 160 through 32768. MS-DOS rounds this number up to a multiple of 16 bytes. The default value is 256. /K command Runs the specified command, program, or batch program and then displays the MS-DOS command prompt. This switch must be the last switch on the COMMAND command line. This switch is particularly useful for specifying a startup batch file for the MS-DOS Prompt in Windows (much like AUTOEXEC.BAT for MS-DOS). To do this, open the DOSPRMPT.PIF file using the PIF Editor, and type the /K switch in the Optional Parameters box. It is not recommended to use the /K switch on the SHELL command line in your CONFIG.SYS file; doing so can cause problems with applications and installation programs that make changes to your AUTOEXEC.BAT file. /P Should be used only when COMMAND is used with the SHELL command in the CONFIG.SYS file. The /P switch makes the new copy of the command interpreter permanent. In this case, the EXIT command cannot be used to stop the command interpreter. If you specify /P, MS-DOS runs your AUTOEXEC.BAT file before displaying the command prompt. If there is no AUTOEXEC.BAT file in the root directory of the startup drive, MS-DOS carries out the DATE and TIME commands instead. If you do not have a SHELL command in your CONFIG.SYS file, COMMAND.COM is automatically loaded from the root directory with the /P switch. /MSG Specifies that all error messages should be stored in memory. Usually, some messages are stored only on disk. This switch is useful only if you are running MS-DOS from floppy disks. You must specify the /P switch when you use the /MSG switch. For more information about using the /MSG switch, see <COMMAND--Notes>. /Y Directs COMMAND.COM to step through the batch file specified by the /C or /K switches. This switch is useful for debugging batch files. For example, to step through the TEST.BAT batch file line by line, you would type COMMAND /Y /C TEST. The /Y switch requires either the /C or the /K switch. Related Command The <SHELL> command is the preferred method of using COMMAND to permanently increase space for the environment table.
-Top- | Notes | Examples | Switches Implemented | SHELL