Unix Exit Status Code Reference

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

0 # successful termination64 # base value for error messages64 # command line usage error65 # data format error66 # cannot open input67 # addressee unknown68 # host name unknown69 # service unavailable70 # internal software error71 # system error (e.g., can't fork)72 # critical OS file missing73 # can't create (user) output file74 # input/output error75 # temp failure; user is invited to retry76 # remote error in protocol77 # permission denied78 # configuration error