Why 0 is true but false is 1 in the shell?

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It’s a convention, but a particularly useful one when you think about it. In general, if a program succeeds that’s all you need to know. If it fails, however, you might need to know all kinds of information about the failure – why it happened, how to fix it, etc. Having zero mean ‘success’ and non-zero mean failure lets you can check pretty easily for success, and investigate the particular error for more details if you want to. A lot of APIs and frameworks have a similar convention – functions that succeed return 0 and and those that fail give back an error code describing the particular failure case.

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