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Here is a list of things to bear in mind when using the
special file names that
gawkis in compatibility mode (see section Command-Line Options).
gawkprints a warning message every time you use one of these files. To obtain process-related information, use the
PROCINFOarray. See section 7.5 Built-in Variables.
gawkalways interprets these special file names.(18) For example, using `/dev/fd/4' for output actually writes on file descriptor 4, and not on a new file descriptor that is
dup'ed from file descriptor 4. Most of the time this does not matter; however, it is important to not close any of the files related to file descriptors 0, 1, and 2. Doing so results in unpredictable behavior.
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