launchctl在launchctl列表输出中具有“状态”（Status）列。 联机帮助页或任何相关的启动联机帮助页都没有提及此列或其含义。
这是该服务的最后退出代码。
launchctl手册页描述了它。
list [-x] [label] With no arguments, list all of the jobs loaded into launchd in three columns. The first column displays the PID of the job if it is running. The second column displays the last exit status of the job. If the number in this column is negative, it repre- sents the negative of the signal which killed the job. Thus, "-15" would indicate that the job was terminated with SIGTERM. The third column is the job's label.