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I am just trying out the FISH - (the FriendlyInteractiveSHell) - CLI & whenever I type in an erroneous Command, a new Prompt appears under the faulty Command prompt with a number in square brackets. I have searched through FISH's FAQs etc., but no joy in explaining the meaning of the error-number? If I hit Enter, the prompt just reappears with the error number until I enter a random correct command, such as 'ls'.

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The number in brackets is the exit status of the last command.

What this means depends entirely on the command. There is a strong understanding that returning 0 means success, but anything else signals some error and the command can choose the exact code.

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