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The %SystemDrive% variable is a special system-wide environment variable found on Windows NT and its derivatives. Its value is the drive upon which the system directory was placed. The value of %SystemDrive% is in most cases "C:". %SystemRoot%
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.
PATH (environment variable) PROGRAMDATA (environment variable) ProgramFiles (environment variable) ProgramFiles(x86) (environment variable) ProgramW6432 (environment variable) PROMPT (environment variable)
Windows environment variables (18 P) Pages in category "Environment variables" The following 6 pages are in this category, out of 6 total.
The variable name is written in all-uppercase under DOS and OS/2. 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.
A special folder can either be a reference to a physical file system directory, or a reference to a "virtual" folder. In the former case, they are analogous to environment variables—in fact, many of the environment variables that are set in a user's session are defined by where the special folders are set to point to.
The runtime environment includes not only accessible state values, but also active entities with which the program can interact during execution. For example, environment variables are features of many operating systems, and are part of the runtime environment; a running program can access them via the runtime system. Likewise, hardware devices ...
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.