ping: Update the man page

Base/usr/share/man/man8/ping.md

@@ -5,15 +5,21 @@ ping - send ICMP ECHO_REQUEST packets to network hosts
 ## Synopsis
 
 ```sh
-$ ping [--count count] [-i interval] [--size size] [--quiet] <host>
+$ ping [--count count] [-i interval] [-W interval] [--size size] [--quiet] [-t ttl] [--adaptive] [--flood] <host>
 ```
 
 ## Options
 
+* `--help`: Display help message and exit.
+* `--version`: Print version.
 * `-c count`, `--count count`: Stop after sending specified number of ECHO_REQUEST packets.
-* `-i interval`: Wait `interval` seconds between sending each packet. Fractional seconds are allowed.
+* `-i interval`: Wait `interval` seconds between sending each ECHO_REQUEST packet. Fractional seconds are allowed. Only super-user can set the interval value less than 0.2 seconds.
+* `-W interval`: Time in seconds to wait for a reply for each packet sent. Fractional seconds are allowed. 0 means infinite timeout.
 * `-s size`, `--size size`: Amount of bytes to send as payload in the ECHO_REQUEST packets.
-* `-q`, `--quiet`: Quiet mode. Only display summary when finished.
+* `-q`, `--quiet`: Quiet mode. Only display the summary when finished.
+* `-t`, `--ttl`: Set the TTL(time-to-live) value of the ICMP packets.
+* `-A`, `--adaptive`: Adaptive ping. The interval between each ECHO_REQUEST adapts to the RTT(round-trip-time).
+* `-f`, `--flood`: Flood ping. For every ECHO_REQUEST sent a period '.' is printed, while for every ECHO_REPLY received a backspace is printed. This provides a rapid display of how many packets are being dropped. If interval is not given, it sets interval to 0 and outputs packets as fast as they come back. Only super-user may use this option with 0 interval.
 
 ## Arguments