Release Notes: The executables gawk, pgawk, and dgawk where merged into gawk. Support for high precision arithmetic with MPFR was implemented. A new -i option was added for loading awk library files. A new -l option was added for loading dynamic extensions. The dynamic extension interface was completely redone. A new "inplace" extension was added, simulating the GNU "sed -i" feature. The and(), or(), and xor() functions now take any number of arguments, with a minimum of two. New arrays SYMTAB, FUNCTAB, and PROCINFO["identifiers"] were introduced. Bugs were fixed.
Release Notes: New options were added. All long options now have corresponding short options. The "--sandbox" option disables the call of system() and write access to the file system. The POSIX 2008 behavior for "sub" and "gsub" is now the default, bringing a change from the previous behavior. Regular expressions were enhanced. Many further enhancements as well as bugfixes and code cleanups were made.