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Full Discussion: Variable with @ sign is driving me crazy
Top Forums UNIX for Dummies Questions & Answers Variable with @ sign is driving me crazy Post 302415919 by MrEddy on Friday 23rd of April 2010 05:20:23 PM
Old 04-23-2010
Variable with @ sign is driving me crazy
Ok so I am working on a command that is going to do a Dig @ a certain IP address which is enclosed in a variable.

Now I thought I had this figure out because it works. The problem is that it does not ALWAYS work.

the variable is IP=192.168.1.1

the commands I have tried are

Code:
dig @${IP} 
dig @"{$IP}"
dig '@'$IP
dig '@'"$IP"

I simply do not get it. All of these seem to work but not all the time. I'll go into one person box and it works fine and then the next one will not like it. Seems that the ones who do not like it are 1 version update behind the ones that do. But, I can't tell whats different. The bash version is the same and the freebsd version is the same. So somewhere somehow its not liking my formatting.

If I take the variable away and just do the command with the IP in there typed by hand it works fine.

Do you guys know what format would be the most universally accepted and least likely to be problematic?
 

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LEARN ABOUT DEBIAN

vlan-interfaces

VLAN-INTERFACES(5)						   File formats 						VLAN-INTERFACES(5)

NAME

       /etc/network/interfaces (vlan) - vlan extensions for the interfaces(5) file format

DESCRIPTION

       /etc/network/interfaces	contains  network  interface  configuration  information  for  the  ifup(8)  and ifdown(8) commands.  This manpage
       describes the vlan extensions to the standard interfaces(5) file format.

       Primary extensions exist to make and destroy vlan interfaces, secondary extensions exist for ipv4 interface manipulation which  are  gener-
       ally needed when using (a lot of) vlans.

VLAN CREATION

       Vlan  interface	definitions  exist  of the vlan interface name, and an optional 'raw-device' parameter.  Vlan interfaces are numbered 1 to
       4095.  You have the option to have interface names zero-padded to 4 numbers, or just the plain digits without leading zero.  The  following
       example shows four ways to create a vlan with id 1 on interface eth0.  They all result in different names.

	iface eth0.1 inet static
	    address 192.168.1.1
	    netmask 255.255.255.0

	iface vlan1 inet static
	    vlan-raw-device eth0
	    address 192.168.1.1
	    netmask 255.255.255.0

	iface eth0.0001 inet static
	    address 192.168.1.1
	    netmask 255.255.255.0

	iface vlan0001 inet static
	    vlan-raw-device eth0
	    address 192.168.1.1
	    netmask 255.255.255.0

	# We don't have br support out of the box
	iface br0.2 inet static
	    vlan-raw-device br0
	    address 192.168.1.1
	    netmask 255.255.255.0

	# Aliases are ignored
	iface br0.2:1 inet static
	    address 192.168.1.1
	    netmask 255.255.255.255

EXTRA IFACE OPTIONS

       Usually someone who uses vlans also wants to do some other manipulations with the ip stack or interface.

       vlan-raw-device devicename
	      Indicates the device to create the vlan on.  This is ignored when the devicename is part of the vlan interface name.

       ip-proxy-arp 0|1
	      Turn proxy-arp off or on for this specific interface.  This also works on plain ethernet like devices.

       ip-rp-filter 0|1|2
	      Set the return path filter for this specific interface.  This also works on plain ethernet like devices.

       hw-mac-address mac-address
	      This sets the mac address of the interface before bringing it up.  This works on any device that allows setting the hardware address
	      with the ip command.

AUTHOR

       This manpage was adapted from interfaces(5) by Ard van Breemen <ard@kwaak.net>

SEE ALSO

       vconfig(8) interfaces(5)

vlan								 September 30 2007						VLAN-INTERFACES(5)
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