1. Unix Exit Status Code Reference

    I always find myself constantly Googling the list of unix status codes (typically defined in sysexits.h).

    0 # successful termination 64 # base value for error messages
    64 # command line usage error
    65 # data format error
    66 # cannot open input
    67 # addressee unknown
    68 # host name unknown
    69 # service unavailable
    70 ...
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