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This package contains a number of functions that allows one to interact
with the operating system from MySQL:

  sys_eval - executes an arbitrary command, and returns it's output.
  sys_exec - executes an arbitrary command, and returns it's exit code.
  sys_get  - gets the value of an environment variable.
  sys_set  - create an environment variable, or update the value of an
             existing environment variable.

Use lib_mysqludf_sys_info() to obtain information about the currently
installed version of lib_mysqludf_sys.

WWW: http://www.mysqludf.org/lib_mysqludf_sys