description:
Send the ICMP ECHO_REQUEST packet to the network host.
fping is a program similar to ping, which uses the Internet Control Message Protocol (ICMP) echo request to determine whether the target host is responding. The difference between fping and ping is that you can specify any number of targets on the command line, or you can specify a file containing a list of ping targets. fping will not send to a target until it times out or responds, but will send ping packets and move to the next target in a round-robin fashion. In the default mode, if the target responds, it is recorded and deleted from the list of targets to be checked; if the target does not respond within a certain time limit and/or retry limit, it is designated as inaccessible. fping also supports sending a specified number of pings to the target, or an infinite loop (such as in ping). Unlike ping, fping is meant to be used in scripts, so its output is designed to be easy to parse. The current statistical information can be obtained without terminating the signal SIGQUIT (key input ^ \ on most systems).
Options:
-4,--ipv4
将名称解析和IP限制为IPv4地址。
-6,--ipv6
将名称解析和IP限制为IPv6地址。
-a,--alive
显示活跃的系统。
-A,--addr
按地址而不是DNS名称显示目标。 与-d组合，输出将既是ip又是主机名（如果有）
-b,--size=BYTES
要发送的ping数据的字节数。 最小大小（通常为12）为fping完成其工作所需的数据（序列号，时间戳）留出空间。 报告的接收数据大小包括IP标头（通常为20个字节）和ICMP标头（8个字节），因此最小总大小为40个字节。 默认值为56，如ping