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Full Discussion: Declare and grep a variable via ssh/remote/loop
Top Forums Shell Programming and Scripting Declare and grep a variable via ssh/remote/loop Post 303021684 by kenshinhimura on Tuesday 14th of August 2018 03:23:18 PM
Old 08-14-2018
Declare and grep a variable via ssh/remote/loop
If I am running a bash command, and some awk getting the ethernet adapter on the local machine. It works fine. But if I will run it from the remote, it is EMPTY on echo and throwing error in grep.
Thank you



This work perfectly fine
Code:
$ f=`/sbin/ip a|grep 127.127 | awk '{print $NF }' ` ; ip a| grep $f

6: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    inet 127.127.127.127/32 brd 127.127.127.127 scope host br0

$ f=`/sbin/ip a|grep 127.127 | awk '{print $NF }' ` ; ip a| grep $f|grep scope
    inet 127.127.127.127/32 brd 127.127.127.127 scope host br0

$ f=`/sbin/ip a|grep 127.127 | awk '{print $NF }' ` ; ip a| grep $f|grep scope
    inet 127.127.127.127/32 brd 127.127.127.127 scope host br0
$

Now from my remote machine:
Code:
$ for i in REMOTEserver; do  ssh $i " f=`/sbin/ip a|grep 127.127 | awk '{print $NF }' ` ; echo $f "  ; done


$ for i in REMOTEserver; do  ssh $i " f=`/sbin/ip a|grep 127.127 | awk '{print $NF }' ` ; echo \$f "  ; done

$ for i in REMOTEserver; do  ssh $i " f=`/sbin/ip a|grep 127.127 | awk '{print $NF }' ` ; echo $f "  ; done


$ for i in REMOTEserver; do  ssh $i " f=`/sbin/ip a|grep 127.127 | awk '{print $NF }' ` ; ip a|grep  $f "  ; done
bash: ip: command not found
Usage: grep [OPTION]... PATTERN [FILE]...
Try 'grep --help' for more information.

$

------ Post updated at 02:23 PM ------

Please close this, i figured it out.
Thank you
 

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LEARN ABOUT DEBIAN

net::arp

ARP(3pm)						User Contributed Perl Documentation						  ARP(3pm)

NAME

       ARP - Perl extension for creating ARP packets

SYNOPSIS

	 use Net::ARP;
	 Net::ARP::send_packet('lo',		     # Device
			       '127.0.0.1',	     # Source IP
			       '127.0.0.1',	     # Destination IP
			       'aa:bb:cc:aa:bb:cc',  # Source MAC
			       'aa:bb:cc:aa:bb:cc',  # Destinaton MAC
			       'reply');	     # ARP operation

       $mac = Net::ARP::get_mac("eth0");

       print "$mac
";

       $mac = Net::ARP::arp_lookup($dev,"192.168.1.1");

       print "192.168.1.1 has got mac $mac
";

   IMPORTANT
       Version 1.0 will break with the API of PRE-1.0 versions, because the return value of arp_lookup() and get_mac() will no longer be passed as
       parameter, but returned!  I hope this decision is ok as long as we get a cleaner and more perlish API.

   DESCRIPTION
       This module can be used to create and send ARP packets and to get the mac address of an ethernet interface or ip address.

       send_packet()
	     Net::ARP::send_packet('lo',		 # Device
				   '127.0.0.1', 	 # Source IP
				   '127.0.0.1', 	 # Destination IP
				   'aa:bb:cc:aa:bb:cc',  # Source MAC
				   'aa:bb:cc:aa:bb:cc',  # Destinaton MAC
				   'reply');		 # ARP operation

	     I think this is self documentating.
	     ARP operation can be one of the following values:
	     request, reply, revrequest, revreply, invrequest, invreply.
	     The default ARP operation is reply.

       get_mac()
	     $mac = Net::ARP::get_mac("eth0");

	     This gets the MAC address of the eth0 interface and stores
	     it in the variable $mac. The return value is "unknown" if
	     the mac cannot be looked up.

       arp_lookup()
	     $mac = Net::ARP::arp_lookup($dev,"192.168.1.1");

	     This looks up the MAC address for the ip address 192.168.1.1
	     and stores it in the variable $mac. The return value is
	     "unknown" if the mac cannot be looked up.

SEE ALSO

	man -a arp

AUTHOR

	Bastian Ballmann [ Balle@chaostal.de ]
	http://www.datenterrorist.de

COPYRIGHT AND LICENSE

       Copyright (C) 2004-2007 by Bastian Ballmann

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.1 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.14.2							    2009-04-24								  ARP(3pm)
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