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898a59eb80
This change to the shell API enables the user to retrieve the return code of the most recently run shell command. This is useful both for users wanting specific information beyond the print statements in a command, but especially for automated users that prefer a simple return code to parsing human readable text. This was tested using all default shell commands, as well as eeprom, flash, and i2c, where specific errors could be forced. In all cases, the correct return value was returned by the new retval command. Signed-off-by: Hunter Searle <hsearle@xes-inc.com>