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Full Discussion: sed extracting numbers
Top Forums Shell Programming and Scripting sed extracting numbers Post 302863085 by Scrutinizer on Saturday 12th of October 2013 06:33:07 AM
Old 10-12-2013
Code:
var=192.168.21.8
IFS=. read _ _ a b << EOF
$var
EOF

or
Code:
var=192.168.21.8
b=${var##*.}
var=${var%*}
a=${var##*.}

bash or ksh93:
Code:
var=192.168.21.8
IFS=. read _ _ a b <<< "$var"


--
@wisecracker, $IFS would need to be saved and restored afterwards
Code:
oldIFS=$IFS
....
IFS=$oldIFS

Last edited by Scrutinizer; 10-12-2013 at 12:34 PM..
This User Gave Thanks to Scrutinizer For This Post:
wisecracker
 

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LEARN ABOUT CENTOS

aggregate-ios

AGGREGATE-IOS(1)					      General Commands Manual						  AGGREGATE-IOS(1)

NAME

       aggregate-ios - optimise a concatenated set of cisco/IOS prefix filters to help make them nice and short.

SYNOPSIS

       aggregate-ios <source_config >optimised_config

DESCRIPTION

       Takes  cisco IOS configuration on stdin, and optimises any prefix filters found using aggregate(1).  Optimised filters are produced on std-
       out.

OPTIONS

       None.

DIAGNOSTICS

       Any diagnostics produced by aggregate(1) are passed through on stderr.

EXAMPLES

       The following configuration fragment:

	 ip prefix-list AS65530 description Foo, Inc
	 ip prefix-list AS65530 permit 10.1.0.0/16
	 ip prefix-list AS65530 permit 10.2.0.0/16
	 ip prefix-list AS65530 permit 10.2.1.0/24
	 ip prefix-list AS65530 permit 10.3.0.0/16
	 ip prefix-list AS65531 description Bar.Com
	 ip prefix-list AS65531 seq 5 permit 192.168.1.0/24
	 ip prefix-list AS65531 seq 10 permit 192.168.2.0/24
	 ip prefix-list AS65531 seq 15 permit 192.168.0.0/19

       is optimised as follows:

	 ip prefix-list AS65530 permit 10.1.0.0/16 le 24
	 ip prefix-list AS65530 permit 10.2.0.0/15 le 24
	 ip prefix-list AS65531 permit 192.168.0.0/19 le 24

SEE ALSO

       aggregate(1)

HISTORY

       Aggregate-ios was written by Joe Abley <jabley@mfnx.net>.

BUGS

       All those in aggregate(1) and then some :)

Joe Abley							 2000 November 27						  AGGREGATE-IOS(1)
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