LinuxQuestions.org - [SOLVED] using sed to send a variable and replace

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greipr

10-06-2010 12:21 PM

using sed to send a variable and replace

Hi! I can't figure out the exact sed to make this work. I've installed CentOS and am trying to pass variables to a network-config file.

variables:
$ipAddress
$netmask
$gateway

file:
DeviceList.Ethernet.eth0.IP=192.168.1.10
DeviceList.Ethernet.eth0.Netmask=255.255.255.0
DeviceList.Ethernet.eth0.Gateway=192.168.1.1

I'm looking to replace the eth0.IP=*.*.*.* with eth0.IP=$ipAddress, and so on for netmask and gateway. How could I get this to work?

crts	10-06-2010 01:07 PM

Hi,
try this

Code:

sed -i -r "s/(eth0\.IP=)[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}/\1$ipAddress/" filename

[EDIT]
A bit more elegant

Code:

sed -i -r "s/(eth0\.IP=)([0-9]{1,3}\.){3}[0-9]{1,3}/\1$ipAddress/" filename

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