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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 FREEBSD

etherswitchcfg

ETHERSWITCHCFG(8)					    BSD System Manager's Manual 					 ETHERSWITCHCFG(8)

NAME

     etherswitchcfg -- configure a built-in Ethernet switch

SYNOPSIS

     etherswitchcfg [-f control file] info
     etherswitchcfg [-f control file] config command parameter
     etherswitchcfg [-f control file] phy phy.register[=value]
     etherswitchcfg [-f control file] port%d [flags] command parameter
     etherswitchcfg [-f control file] reg register[=value]
     etherswitchcfg [-f control file] vlangroup%d command parameter

DESCRIPTION

     The etherswitchcfg utility is used to configure an Ethernet switch built into the system.	etherswitchcfg accepts a number of options:

     -f control file
	 Specifies the etherswitch(4) control file that represents the switch to be configured.  It defaults to /dev/etherswitch0.
     -m  When reporting port information, also list available media options for that port.
     -v  Produce more verbose output.  Without this flag, lines that represent inactive or empty configuration options are omitted.

   config
     The config command provides access to global switch configuration parameters.  It support the following commands:

     vlan_mode mode  Sets the switch VLAN mode (depends on the hardware).

   phy
     The phy command provides access to the registers of the PHYs attached to or integrated into the switch controller.  PHY registers are speci-
     fied as phy.register, where phy is usually the port number, and register is the register number.  Both can be provided as decimal, octal or
     hexadecimal numbers in any of the formats understood by strtol(3).  To set the register value, use the form instance.register=value.

   port
     The port command selects one of the ports of the switch.  It supports the following commands:

     pvid number  Sets the default port VID that is used to process incoming frames that are not tagged.
     media mediaspec
		  Specifies the physical media configuration to be configured for a port.
     mediaopt mediaoption
		  Specifies a list of media options for a port.  See ifconfig(8) for details on media and mediaopt.

     And the following flags (please note that not all flags are supported by all switch drivers):

     addtag  Add VLAN tag to each packet sent by the port.
     -addtag
	     Disable the add VLAN tag option.
     striptag
	     Strip the VLAN tags from the packets sent by the port.
     -striptag
	     Disable the strip VLAN tag option.
     firstlock
	     This options makes the switch port lock on the first MAC address it sees.	After that, usually you need to reset the switch to learn
	     different MAC addresses.
     -firstlock
	     Disable the first lock option.  Note that sometimes you need to reset the switch to really disable this option.
     dropuntagged
	     Drop packets without a VLAN tag.
     -dropuntagged
	     Disable the drop untagged packets option.
     doubletag
	     Enable QinQ for the port.
     -doubletag
	     Disable QinQ for the port.
     ingress
	     Enable the ingress filter on the port.
     -ingress
	     Disable the ingress filter.

   reg
     The reg command provides access to the registers of the switch controller.

   vlangroup
     The vlangroup command selects one of the VLAN groups for configuration.  It supports the following commands:

     vlan VID	Sets the VLAN ID (802.1q VID) for this VLAN group.  Frames transmitted on tagged member ports of this group will be tagged with
		this VID.  Incoming frames carrying this tag will be forwarded according to the configuration of this VLAN group.
     members port,...
		Configures which ports are to be a member of this VLAN group.  The port numbers are given as a comma-separated list.  Each port
		can optionally be followed by ``t'' to indicate that frames on this port are tagged.

FILES

     /dev/etherswitch?	Control file for the Ethernet switch driver.

EXAMPLES

     Configure VLAN group 1 with a VID of 2 and make ports 0 and 5 its members while excluding all other ports.  Port 5 will send and receive
     tagged frames while port 0 will be untagged.  Incoming untagged frames on port 0 are assigned to vlangroup1.

	   # etherswitchcfg vlangroup1 vlan 2 members 0,5t port0 pvid 2

SEE ALSO

     etherswitch(4)

HISTORY

     etherswitchcfg first appeared in FreeBSD 10.0.

AUTHORS

     Stefan Bethke

BSD
								September 20, 2013							       BSD
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