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While the content of environment variables remains unchanged upon storage, their names (without the "%") are always converted to uppercase, with the exception of pre-environment variables defined via the CONFIG.SYS directive SET under DR DOS 6.0 and higher [11] [12] (and only with SWITCHES=/L (for "allow lowercase names") under DR-DOS 7.02 and ...
Pages in category "Windows environment variables" The following 18 pages are in this category, out of 18 total. This list may not reflect recent changes. A.
Under Windows, which also supports lowercase environment variable names, the variable name is defined as ComSpec in the environment block, but as COMSPEC inside the DOS emulator NTVDM. When not present in the environment block, the command processor CMD.EXE of Windows NT sets COMSPEC to its own full path; it evaluates COMSPEC for example to ...
PATH is an environment variable on Unix-like operating systems, DOS, OS/2, and Microsoft Windows, specifying a set of directories where executable programs are located. In general, each executing process or user session has its own PATH setting.
The %username% and %userprofile% environment variables can also be used with Folder Redirection. Up to Windows XP, the Application Data, Desktop, My Documents, My Pictures, and Start Menu special folders can be redirected to a file server. Windows XP also implements a Recycle Bin for the My Documents folder.
Environment variables are a facility provided by some operating systems.Within the OS's shell (ksh in Unix, bash in Linux, COMMAND.COM in DOS and CMD.EXE in Windows) they are a kind of variable: for instance, in unix and related systems an ordinary variable becomes an environment variable when the export keyword is used.
On earlier versions, such as Windows 2000 or Windows NT 4.0, the maximum length of the string is 2047 (2 11-1) characters. This limit includes the command line, individual environment variables that are inherited by other processes, and all environment variable expansions. [10] Quotation marks are required for the following special characters: [8]
command.com running in a Windows console on Windows 95 (MS-DOS Prompt) COMMAND.COM is the default command-line interpreter for MS-DOS, Windows 95, Windows 98 and Windows Me. In the case of DOS, it is the default user interface as well. It has an additional role as the usual first program run after boot (init process).
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