基于主机名列表获取IP地址的有效方法 [英] Efficient way to get ip addresses based on a list of hostnames

问题描述

 我必须从主机名列表中收集IP地址列表， ＃！/ bin / bash 
 Hosts ='host1 host2 host3 host4 host5 host6 host7'
 
 for $ in $ Hosts 
 do 
 echo$ h：$ （ping -c 1 $ h | egrep -o -m 1'\（[0-9] + \。[^ \（\r\\\
）* \''）done 
  

有没有更高效的方法来做到这一点？

解决方案

如果你的意思是延迟让你失望，你可以使用GNU Parallel并行执行它们：

  parallel -a hosts'echo -n {}; ping -c1 {} | egrep -o -m 1\（[0-9] + \。[^ \（\r\ N] * \\ \\）'
  

-a hosts 假设您在名为 hosts 的文件中拥有主机名。

hosts： p>

  virgin 
路由器
  

输出：

 处女（192.168.100.1）
路由器（192.168.0.1）
  

或者，如果您不需要主机名文件，您可以使用你的循环：

  for h in virgin router;做
 echo $ h; 
完成|并行'echo -n {}; ping -c1 {} | egrep -o -m 1\（[0-9] + \。[^ \（\r\\\
）* \）'
  

或者，查看 arp 缓存...

  arp router 
 router.asus.com（192.168.0.1）at 8：60：6e：ba：17：c8 on en0 ifscope [ethernet] 
 
 arp virgin 
 virgin（192.168.100.1） -  no entry 
  

I had to gather a list of IP addresses from a list of hostnames, this is what I came up with:

#!/bin/bash                                                                                                
Hosts='host1 host2 host3 host4 host5 host6 host7' 

for h in $Hosts                                                                                            
do                                                                                                         
    echo "$h : " $(ping -c 1 $h | egrep -o -m 1 '\([0-9]+\.[^\(\r\n]*\)')    done 

Is there a more efficient way to do this?

解决方案

If you mean the latency gets you down, you can do them all in parallel with GNU Parallel:

parallel -a hosts 'echo -n {}; ping -c1 {} |egrep -o -m 1 "\([0-9]+\.[^\(\r\n]*\)"'

The -a hosts assumes you have the hostnames in a file called hosts.

hosts:

virgin
router

Output:

virgin(192.168.100.1)
router(192.168.0.1)

Or, if you don't want a file of hostnames, you can use your loop:

for h in virgin router; do 
   echo $h; 
done | parallel 'echo -n {}; ping -c1 {} |egrep -o -m 1 "\([0-9]+\.[^\(\r\n]*\)"'

Alternatively, have a look in the arp cache...

arp router
router.asus.com (192.168.0.1) at 8:60:6e:ba:17:c8 on en0 ifscope [ethernet]

arp virgin
virgin (192.168.100.1) -- no entry

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