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Shell Programming and Scripting

Simple SED issue

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# 1  
Old 10-06-2010
Simple SED issue
Hi! I'm a newbie and can't find 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?
# 2  
Old 10-06-2010
Code:
$
$
$ ipAddress="Athos"
$ netmask="Porthos"
$ gateway="Aramis"
$
$ cat f31
DeviceList.Ethernet.eth0.IP=192.168.1.10
DeviceList.Ethernet.eth0.Netmask=255.255.255.0
DeviceList.Ethernet.eth0.Gateway=192.168.1.1
$
$
$ sed -e "s/^\(.*IP=\).*$/\1$ipAddress/" -e "s/^\(.*Netmask=\).*$/\1$netmask/" -e "s/^\(.*Gateway=\).*$/\1$gateway/" f31
DeviceList.Ethernet.eth0.IP=Athos
DeviceList.Ethernet.eth0.Netmask=Porthos
DeviceList.Ethernet.eth0.Gateway=Aramis
$
$

tyler_durden
# 3  
Old 10-06-2010
Slightly different sed:
Code:
sed "/Netmask/s/=.*/=$netmask/;/IP=/s/=.*/=$ipAddress/;/Gateway/s/=.*/=$gateway/" infile

# 4  
Old 10-06-2010
Thanks guys for the prompt replies! My fault, I didn't provide all the background, so I did a little bit more research and testing and I got it to work so far .. *fingers crossed*.

I'm passing the sed command from a client browser page in a .php script. It didn't like the "" so I edited the code you provided and went to a single '

sudo sed -i 's/^\(.*IP=\).*$/\'1$ipAddress'/' infile;

I haven't put it all together yet but this part seems to work correctly.

After I'm done I'll take a whack at it with Scrutinizers code as well so I can help myself understand what I'm doing. Smilie
# 5  
Old 10-06-2010
Try this
Code:
sudo sed -i 's/^\(.*IP=\).*$/\1'$ipAddress'/' infile

Move 1 to before single quote
# 6  
Old 10-06-2010
By awk
Code:
awk '
BEGIN{FS=OFS="="}
/IP/ {$2="'$ipAddress'"}
/Netmask/ {$2="'$netmask'"}
/Gateway/ {$2="'$gateway'"}1
' infile

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