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# 1  
Old 07-01-2008
Question sed not working for me.
Hi All,
I need to modify ifcfg-eth0 file. The file currently contains the following:

Code:
ONBOOT=no

The desired output of the file is:

Code:
ONBOOT=no
DEVICE=eth0
BOOTPROTO=static
IPADDR=234.235.34.56
NETMASK=255.255.255.0
GATEWAY=234.235.34.1

I know sed can help me in this, and this is what I tried.

Code:
sed '1i\
DEVICE=eth0 
' ifcfg-eth0 >> temp1
sed '2i\
BOOTPRO=static 
' ifcfg-eth0>> temp1

But this is somehow not working.. Can anyone let me know, where I may be going wrong here.
# 2  
Old 07-01-2008
Assuming you want to append the lines after the line "ONBOOT=no":

Code:
awk '/ONBOOT=no/{
print
print "DEVICE=eth0"
print "BOOTPROTO=static"
print "IPADDR=234.235.34.56"
print "NETMASK=255.255.255.0"
print "GATEWAY=234.235.34.1"
next
}1' file > new_file

Regards
# 3  
Old 07-01-2008
Thanks a lot Franklin52 for the awk command. I need to take the ipaddress from the user, so is it possible to use variables in this command.

I am not very good at the awk commands, but I have tried the following.I guess awk variables are different so I imported the ip variable, but it does not evaluate the unix command in there.

Code:
ip=234.235.34.56
export ip
awk '/ONBOOT=no/{
print
print "DEVICE=eth0"
print "BOOTPROTO=static"
print "IPADDR=`echo$ip`"
print "NETMASK=255.255.255.0"
print "GATEWAY=234.235.34.1"
next
}1' temp > temp1

Output of the file:

Code:
ONBOOT=no
DEVICE=eth0
BOOTPROTO=static
IPADDR=`echo$ip`
NETMASK=255.255.255.0
GATEWAY=234.235.34.1

Can you please help..
# 4  
Old 07-01-2008
Something like:

Code:
awk -v ip="234.235.34.56" '/ONBOOT=no/{
print
print "DEVICE=eth0"
print "BOOTPROTO=static"
print "IPADDR=" ip
print "NETMASK=255.255.255.0"
print "GATEWAY=234.235.34.1"
next
}1' file > new_file

Regards
# 5  
Old 07-01-2008
Thanks a lot!! This helps!
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