<1>

d211 admin # for i in {3..254} ; do ping -c 1 192.168.1.$i &>/dev/null && echo 192.168.1.$i is alive ;done
192.168.1.5 is alive
192.168.1.7 is alive

<2>

fping -a -g 192.168.5.1 192.168.5.177 -s -n >lele.txt

-a   Show systems that are alive.

-g   Generate a target list from a supplied IP netmask, or a starting and ending IP. Specify the net mask or start/end in the targets portion of the command line.

ex. To ping the class C 192.168.1.x, the specified command line could look like either:

fping -g 192.168.1.0/24  or   fping -g 192.168.1.0 192.168.1.255

-s   Print cumulative statistics upon exit.                        -n   Same as -d.

-d   Use DNS to lookup address of return ping packet. This allows you to give fping a list of IP
addresses as input and print hostnames in the output.

eg:

i161 bijiao # fping -a -g 192.168.5.4 192.168.5.254 -s >jiancela.txt  2> /dev/null      //错误信息不进行输出

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------

ICMP Host Unreachable from 192.168.5.161 for ICMP Echo sent to 192.168.5.4
ICMP Host Unreachable from 192.168.5.161 for ICMP Echo sent to 192.168.5.5
ICMP Host Unreachable from 192.168.5.161 for ICMP Echo sent to 192.168.5.6
ICMP Host Unreachable from 192.168.5.161 for ICMP Echo sent to 192.168.5.7
ICMP Host Unreachable from 192.168.5.161 for ICMP Echo sent to 192.168.5.8
ICMP Host Unreachable from 192.168.5.161 for ICMP Echo sent to 192.168.5.9
ICMP Host Unreachable from 192.168.5.161 for ICMP Echo sent to 192.168.5.10
ICMP Host Unreachable from 192.168.5.161 for ICMP Echo sent to 192.168.5.11
ICMP Host Unreachable from 192.168.5.161 for ICMP Echo sent to 192.168.5.12
ICMP Host Unreachable from 192.168.5.161 for ICMP Echo sent to 192.168.5.13
ICMP Host Unreachable from 192.168.5.161 for ICMP Echo sent to 192.168.5.14

。。。。。。。。。。。。。。

251 targets
65 alive
186 unreachable
0 unknown addresses

0 timeouts (waiting for response)
369 ICMP Echos sent
65 ICMP Echo Replies received
185 other ICMP received

0.02 ms (min round trip time)
0.32 ms (avg round trip time)
2.40 ms (max round trip time)
9.232 sec (elapsed real time)

i161 bijiao # cat jiancela.txt
192.168.5.101
192.168.5.120
192.168.5.121
192.168.5.157
192.168.5.158
192.168.5.159
192.168.5.160
192.168.5.161