timeout

• run a command with a time limit。
  这个命令也是很有用，可以帮助执行命令设置timeout时间。

用法参数

timeout [OPTION] DURATION COMMAND [ARG]…
启动COMMAND，如果这个命令在DURATION之后仍然在运行，就kill掉这个命令。
Mandatory arguments to long options are mandatory for short options too.
–preserve-status
exit with the same status as COMMAND, even when the command times out
–foreground
when not running timeout directly from a shell prompt, allow COMMAND to read from the TTY and get TTY signals; in this mode, children of COMMAND will not be timed out
-k, --kill-after=DURATION
also send a KILL signal if COMMAND is still running this long after the initial signal was sen