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Need help to replace a pattern with a blank line

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# 1  
Old 01-25-2012
Need help to replace a pattern with a blank line
Need help to replace the line beginning with tcp_sendspace with a blank line.
Code:
# cat if
en0: flags=1e080863,480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
        inet 10.27.53.21 netmask 0xffffff00 broadcast 10.207.52.255
        inet 10.27.58.48 netmask 0xffffff00 broadcast 10.207.52.255
         tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
en1: flags=1e080863,480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
        inet 10.26.52.25 netmask 0xffffff00 broadcast 10.207.52.255
        inet 10.26.52.41 netmask 0xffffff00 broadcast 10.207.52.255
         tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
lo0: flags=e08084b,c0<UP,BROADCAST,LOOPBACK,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,LARGESEND,CHAIN>
        inet 127.0.0.1 netmask 0xff000000 broadcast 127.255.255.255
        inet6 ::1%1/0
         tcp_sendspace 131072 tcp_recvspace 131072 rfc1323 1

Also, I am not able to figure out how can I get the following output:
Code:
en0:10.27.53.21 
en0:10.27.53.21
       
en1:10.26.52.25
en1:10.26.52.41

Thanks in advance....
Last edited by Franklin52; 01-26-2012 at 03:46 AM.. Reason: Please use code tags for code and data samples, thank you
# 2  
Old 01-25-2012
If you just want those lines to be blank:

Code:
sed 's/^tcp_sendspace.*//' input-file >output-file

If you'd like not to have the 'holes' in the file then
Code:
sed '/^tcp_sendspace/d' input-file >output-file

Your example output showed the elimination of all but the en.* lines. If that's what you want use grep for ^en.* or if you really want the blank lines:

Code:
awk '/^en[0-9]/ {print; next} {printf( "\n" );}' input-file >output-file

awk '
# 3  
Old 01-26-2012
Thanks for the reply but none of these server my purpose:

1)
Code:
sed 's/^tcp_sendspace.*//'

and
Code:
sed '/^tcp_sendspace/d'

DO NOT replace the line starting with ^tcp_space with a blank line. I am on AIX.

2)
Code:
# awk '/^en[0-9]/ {print; next} {printf( "\n" );}' filename
en0: flags=1e080863,480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>



en1: flags=1e080863,480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>

I get the output seen above.....


I need something like:
Code:
en0:10.27.53.21 
en0:10.27.53.21
       
en1:10.26.52.25
en1:10.26.52.41

Last edited by Franklin52; 01-26-2012 at 03:47 AM.. Reason: Please use code tags for code and data samples, thank you
# 4  
Old 01-26-2012
Would this be good enough?
Code:
 
$ awk '/^[^ ]/{en=$1}/^ *inet /{print en,$2}' infile
en0: 10.27.53.21
en0: 10.27.58.48
en1: 10.26.52.25
en1: 10.26.52.41
lo0: 127.0.0.1

This User Gave Thanks to mirni For This Post:
sags007_99
# 5  
Old 01-27-2012
That one does not give me the required output either....

Which OS are you using?
# 6  
Old 01-27-2012
Perl.
Code:
perl -ane 'if (/flags=/ .. /tcp_sendspace/) {
    (/flags=/) && ($x = $F[0]);
    (/inet/) && print "$x $F[1]\n";
    (/tcp_sendspace/ && !eof) && print "\n";
}' inputfile

# 7  
Old 01-27-2012
Quote:
That one does not give me the required output either....
What output does it give you, if any? The more specific you are in your questions, requirements and responses, the more accurate and faster you receive help.
Can you please post what version of awk are you using:
Code:
awk --version

Is what you posted in your first post exactly what you are trying to process?
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