How to get ethernet adapter name in a variable having link/ether using perl script?

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Using perl script I want to find the name of ethernet adapter which are having specific string "link/ether" when we do "ip/addr". I want to store them in a variable. like:-

3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:21:28:d6:1f:f9 brd ff:ff:ff:ff:ff:ff
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:21:28:d6:1f:fa brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:21:28:d6:1f:fb brd ff:ff:ff:ff:ff:ff
6: ab0:  <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/band 00:21:28:d6:1f:fb brd ff:ff:ff:ff:ff:ff

from above out should output the following:-

eth1
eth2
eth3

like storing in a variable and running in loop. This is what I was trying but not working properly:-

my $last="";
my @results = `ip addr`;
my $adap="";
my $flag=0;
foreach my $line (@results)
{
if (($line =~ /ether/))
{
   $adap = substr($last,3,7);
   chomp($adap);
   $str = $adap;
   $flag=1;
}
}
print $adap;

Try this

my @results = 
    map { /^ \d+ : \s+ ( eth \d+ ) :/xa; $1 }
    grep { /ether/ } 
    `ip addr`;

print @results;

This takes the list returned by `ip addr` removes any line not containing ether grep { /ether/ } then captures the part of the string containing eth followed by 1 or more digits.

The x on the end of the regex allows embedded white space and the a limits \d to just ascii digits.

You don't need to chomp the lines as you want the line endings when you print the list back out.

List only the device names of all available network interfaces, ip -o l|perl -lane'$F[1]=~s/://g;print $F[1]' Here's one way to extract the interface names from the ifconfig output: I have a bunch of virtual interfaces, and would like to get a list, usable in various bash scripts. fe80::a00:27ff:fe8c:6bd3 prefixlen 64 scopeid 0x20<link> ether 08:00:27:8c:6b:d3 txqueuelen 1000 (​Ethernet) RX  PS C:\> Get-NetAdapter -Name "*" | Format-Table -View Name. This command gets the visible network adapters and formats the output to present various names by which a network adapter can be identified such as the Name, InterfaceDescription, and InterfaceName parameter values. Runs the cmdlet as a background job. Use this parameter to run

It can work like below and just store output in @array:-

ip -o addr show | grep "ether"  | awk -F': ' '{print $2}'

How to get my own IP address and save it to a variable in a shell , To get IPv4 and IPv6 addresses, and not assume the main interface is eth0 (​these So, you can use this to demonstrate that, yes, all machines have multiple IP "on match" - otherwise only the first command to following the match would be 64 scopeid 0x20<link> ether b8:27:eb:b2:96:84 txqueuelen 1000 (Ethernet) lo:  0 How to copy data from one s3 bucket to another using async io( fast manner) in python? Sep 6 '19 0 How to get ethernet adapter name in a variable having link/ether using perl script?

Ok. I think this does what you want.

#!/usr/bin/perl

use strict;
use warnings;

# Get the results from "ip addr". Store in @results.
my @results = `ip addr`;

# Variable to store the previous line
my $prev_line;

foreach my $line (@results) {
   # If the current line matches...
   if ($line =~ m|link/ether|) {
      # ... the extract the adapter name from the previous line
      my ($adap) = $prev_line =~ /: (\w+):/;
      print "$adap\n";
   }
   # Store the current line (which becomes the previous line).
   $prev_line = $line;
 }

For future reference, it's really helpful if you give us actual code that exhibits the behaviour you're asking about.

scripts - Displaying IP address on eth0 interface, So whatever how many interfaces I'll have and whatever their name, GREP will only grab the first having the MULTICAST option. I use this  Using perl script I want to find the name of ethernet adapter which are having specific string "link/ether" when we do "ip/addr". I want to store them in a variable. like:- 3: eth1: &lt;BROADCAST,

Change default network interface name "ens" to old “eth” on RHEL7 , howTo Change default network interface name "ens" to old “eth” Bash Scripting · Perl · Python UP mode DEFAULT qlen 1000 link/ether 52:54:00:5f:d0:20 brd ff​:ff:ff:ff:ff:ff Further we have to update grub2 with following command. Passing Variable Between Functions · LINUX How To Determine The  Using Netsh. To rename the network adapter by using Netsh, I need to know the interface name and the new name I want to use. That is about it. To find the network adapter names, I can also use Netsh. Here is the command: netsh interface ipv4 show interfaces. Netsh is available everywhere right now.

Linux: Show / Display Available Network Interfaces, We have one Linux CentOS7 machine , which will used run those ip command used in Linux show/manipulate routing, devices, policy routing and tunnels. But we can also use it to show brief details of available interface like below. mode DEFAULT qlen 1000 link/ether 52:54:00:43:d0:c3 brd ff:ff:ff:ff:ff:ff. It is possible to use WMI and the Win32_NetworkAdapter WMI class to retrieve information about the connection status. The NetConnectionStatus property reports a coded value that reports the status. These values are documented on MSDN: Win32_NetworkAdapter class. By using the Get-WmiObject Windows PowerShell cmdlet, I can work with any operating

linux - CentOS 7 how to get interface name by macaddress?, I'm trying to figure out how I can get the network interface name and then However I want to have a script or command where I have it auto set the link name I've been trying to do it by "ip link show" and using awk, but i've had no luck. the interface into a variable and then used that to set the new name With some of these examples, you can see how PowerShell is now your go-to tool for reviewing your NIC configuration, as well as for being able to make changes to any adapter that you have on your system. About the Author. Boe Prox is a Microsoft MVP in Windows PowerShell and a Senior Windows System Administrator. He has worked in the IT field

Comments
  • What is in $last? You don't show that variable being set. Did you mean $line?
  • @DaveCross- Updated the code above
  • Ok. Now you're trying to take a substr() of an empty string. I'm pretty sure that should be substr($line, 3, 7).
  • @DaveCross - was doing "$last = $line;" at end , basic idea is to grep interface name containing "link/ether"
  • I'm not sure how I was supposed to guess that :-) I can only give advice based on the code you show me. Nevertheless, I think that if you look at $line rather than $last, it will work.
  • perl getin.pl Bareword found where operator expected at getin.pl line 3, near "/^ \d+ : \s+ ( eth \d+ ) :/xa" (Missing operator before a?) syntax error at getin.pl line 3, near "/^ \d+ : \s+ ( eth \d+ ) :/xa" Execution of getin.pl aborted due to compilation errors.
  • Ah ok you are using an older version of Perl. Remove the a in /xa or get a newer version of Perl