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Full Discussion: awk not escape my bash variable
Top Forums Shell Programming and Scripting awk not escape my bash variable Post 302545780 by winggundamth on Tuesday 9th of August 2011 01:28:12 PM
Old 08-09-2011
awk not escape my bash variable
I tried to parse data from switch configuration files

Code:
vlan 1727 name SQ5506-15 by port
 tagged ethe 8/1 to 8/2 
 untagged ethe 1/13 
!
vlan 2105 name SQ5620-7007(BR2) by port
 tagged ethe 8/1 to 8/2 
 untagged ethe 1/17 
!
interface ethernet 1/13
 port-name SQ5506-15.nic0
 rate-limit input fixed 10000000
 sflow forwarding
!
interface ethernet 1/17
 port-name SQ5620-7007.nic0
 rate-limit input fixed 100000000
 sflow forwarding
!

At first I parse interface number by device name and switch path with this command

Code:
INTERFACE=`awk '/^vlan(.*)'"$DEVICE "'(.*)/,/^!/' "$SWITCH_PATH" | awk '/untagged/{print $3}'`

Then I tried to get rate limit from interface that I parse from above with this command

Code:
RATELIMIT=`awk '/^interface ethernet '"$INTERFACE"'\r(.*)/,/^!/' "$SWITCH_PATH" | awk '/rate-limit/{print $4}'`

But it is showing an error

Code:
awk: /^interface ethernet 1/13\r(.*)/,/^!/
awk:                          ^ backslash not last character on line

If $INTERFACE is single number like "74" it will work but if $INTERFACE has forward slash like "1/13" it will showing an error as above. I have tried with put direct interface number and found that I have to put backslash before forward slash in interface number like this

Code:
RATELIMIT=`awk '/^interface ethernet '"1\/13"'\r(.*)/,/^!/' "$SWITCH_PATH" | awk '/rate-limit/{print $4}'`

I also tried with awk -v too but no luck. It is showing no error but still can't get value what I want

Code:
RATELIMIT=`awk -v INTERFACE="$INTERFACE" '/^interface ethernet INTERFACE\r(.*)/,/^!/' "$SWITCH_PATH" | awk '/rate-limit/{print $4}'`

I tried with every possible changing quote and double quote but still no luck. Can someone help me this?
 

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LEARN ABOUT REDHAT

vconfig

VCONFIG(8)						      System Manager's Manual							VCONFIG(8)

NAME

       vconfig - VLAN (802.1q) configuration program.

SYNOPSIS

       vconfig [lots of long options]

DESCRIPTION

       The  vconfig program allows you to create and remove vlan-devices on a vlan enabled kernel. Vlan-devices are virtual ethernet devices which
       represents the virtual lans on the physical lan.

OPTIONS

       add [interface-name] [vlan-id]
	      Creates a vlan-device on [interface-name]. The resulting vlan-device will be called according to the nameing convention set.

       rem [vlan-device]
	      Removes the named vlan-device.

       set_flag [vlan-device] 0 | 1
	      When 1, ethernet header reorders are turned on. Dumping the device will appear as a  common  ethernet  device  without  vlans.  When
	      0(default)  however,  ethernet  headers are not reordered, which results in vlan tagged packets when dumping the device. Usually the
	      default gives no problems, but some packet filtering programs might have problems with it.

       set_egress_map [vlan-device] [skb-priority] [vlan-qos]
	      This flags that outbound packets with a particular skb-priority should be tagged with the particular  vlan  priority  vlan-qos.  The
	      default vlan priority is 0.

       set_ingress_map [vlan-device] [skb-priority] [vlan-qos]
	      This  flags  that  inbound  packets  with the particular vlan priority vlan-qos should be queued with a particular skb-priority. The
	      default skb-priority is 0.

       set_name_type VLAN_PLUS_VID | VLAN_PLUS_VID_NO_PAD | DEV_PLUS_VID | DEV_PLUS_VID_NO_PAD
	      Sets the way vlan-device names are created. Use vconfig without arguments to see the different formats.

       NOTES  VLAN will use Broadcom's NICE interface when the network device supports it. This is necessary, since usually the hardware of  these
	      devices  already	removes the vlan tag from the ethernet packet. The set_flag option on vlan-devices created on such a physical net-
	      work device will be ignored.  Dumping the network-device will show only untagged(non-vlan) traffic,  and	dumping  the  vlan-devices
	      will only show traffic intended for that vlan, without the tags.

FILES

       /proc/net/vlan/config
       /proc/net/vlan/[vlan-device]

SEE ALSO

       ip(8), ifconfig(8)

AUTHORS

       This manual page was written by Ard van Breemen <ard@kwaak.net>
       The vlan patch is written by Ben Greear <greearb@candelatech.com>

																	VCONFIG(8)
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