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Unix Programming - Environment Variables - Portability to Other Operating Systems
Environment variables have only very limited portability off
Unix. Microsoft operating systems have an environment-variable feature
modeled on that of Unix, and use a PATH variable as
Unix does to set the binary search path, but most of other variables
that Unix shell programmers take for granted (such as process ID or
current working directory) are not supported. Other operating systems
(including classic MacOS) generally do not have any local equivalent
of environment variables.
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