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Epsilon User's Manual and Reference > Variable Reference >

opsys: variable

The opsys variable tells which operating system version of Epsilon is running, using the following macros defined in codes.h. OS_WINDOWS (or synonym OS_DOS), defined as 1, indicates one of the Windows versions (or else the DOS version) is running. (See the is-gui variable to distinguish these.) OS_OS2, defined as 2, indicates the OS/2 version is running. OS_UNIX, defined as 3, indicates Epsilon is running on a platform with UNIX-derived internals: macOS, Linux, or FreeBSD. (See the is-unix variable to distinguish these.)

More info:

System Primitives (Primitives)

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Epsilon Programmer's Editor 14.04 manual. Copyright (C) 1984, 2021 by Lugaru Software Ltd. All rights reserved.