(gawk.info.gz) Special Caveats

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 5.7.3 Special File Name Caveats
 -------------------------------
 
 Here is a list of things to bear in mind when using the special file
 names that `gawk' provides:
 
    * Recognition of these special file names is disabled if `gawk' is in
      compatibility mode ( Options).
 
    * `gawk' _always_ interprets these special file names.  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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