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This section describes features and/or command-line options from
previous releases of gawk that are either not available in the
current version or that are still supported but deprecated (meaning that
they will not be in the next release).
For version 3.1 of gawk, there are no
deprecated command-line options
from the previous version of gawk.
The use of next file (two words) for nextfile was deprecated
in gawk 3.0 but still worked. Starting with version 3.1, the
two-word usage is no longer accepted.
The process-related special files described in
Special Files for Process-Related Information,
work as described, but
are now considered deprecated.
gawk prints a warning message every time they are used.
(Use PROCINFO instead; see
Built-in Variables That Convey Information.)
They will be removed from the next release of gawk.