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message

Contains a human-readable string indicating what happened with the last executed statement.

• If a command could not be executed or had improper values, the value of _lastrc.message is ERROR.
• If a command successfully executed, the value of _lastrc.message is either SUCCESS or some other message (depending upon the command).

result

Holds an integer value that indicates the result of the last command executed.
 
The meaning of this value depends on the command. Unless otherwise stated:

• -1 indicates failure.
• 0 or a positive value indicates success.

This value does not affect the value of _rc and _lastrc.