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up vote 3 down vote favorite

When I used this command on Red Hat Linux

/usr/sbin/ss -i

I get the following output below:

State       Recv-Q Send-Q                                            Local Address:Port                                                Peer Address:Port
ESTAB       0      0                                                    <IP_ADD:PORT>                                                  <IP_ADD:PORT>
         ts sack wscale:2,2 rto:204 rtt:4.5/6.5 ato:40 cwnd:3
ESTAB       0      0                                                    <IP_ADD:PORT>                                                  <IP_ADD:PORT>
         ts sack wscale:2,2 rto:213 rtt:13.875/18.5 ato:40
ESTAB       0      0                                                    <IP_ADD:PORT>                                                  <IP_ADD:PORT>
         ts sack wscale:2,2 rto:201 rtt:1.875/0.75 ato:40
ESTAB       0      0                                                    <IP_ADD:PORT>                                                 <IP_ADD:PORT>
         ts sack wscale:9,2 rto:201 rtt:1.875/0.75 ato:40

Whenever I try to pipe grep to that command ex:

/usr/sbin/ss -i | grep <SOME_IP_ADD>

I have this output

ESTAB      0      0              <IP_ADD:PORT>           <IP_ADD:PORT>
ESTAB      0      0              <IP_ADD:PORT>           <IP_ADD:PORT>
ESTAB      0      0              <IP_ADD:PORT>           <IP_ADD:PORT>

Notice that grep didn't include this:

ts sack wscale:2,2 rto:204 rtt:4.5/6.5 ato:40 cwnd:3

because its on another line. So how do I adjust the column width whenever I use this command or other linux commands for that matter. So that the output will not word-wrap or goto the next line? Better yet are their better ways of doing this? Thanks alot!

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2 Answers

up vote 4 down vote accepted

If your grep has it, try the -A1 option.

It looks like it is not a case of wrapping, but that the entry is on a separate line.

/usr/sbin/ss -i | grep -A1 <SOME_IP_ADD>

Look at Context Line Control in man grep.

An alternative would be to use 

-P Perl-regex 
-z suppress-newline
-o print only matching

as in:

ss -i | grep -Pzo '.*IPADDRESS.*\n.*'

Then you won't get the surrounding dashes which context gives.

An alternative could be sed:

sed -n '/IPADDRESS/{N;p}'
# Or joining the two lines by:
ss -i | sed -n '/IPADDRESS/N;s/\n/ /p'

awk:

awk '/IPADDRESS/{print; getline; print}'
# Or as joined lines:
awk '/IPADDRESS/{printf "%s ", $0; getline; print}'
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Hey thanks sukminder your suggestions worked!!! But I don't know where to give the points though since both of you answered at the same time :s – dimas Apr 24 at 1:15
Yes, – that can be a dilemma but thanks. I'll up-vote @drs ;) – Sukminder Apr 24 at 1:19
up vote 3 down vote

The ts sack ... line is placed below the ESTAB ... line because that is how ss always formats this type of information. It's not being line-wrapped. You can include both lines in grep by using the -A1 flag:

ss -i | grep <IP ADDRESS> -A1

You can combine each match to one line by passing it through a sed command:

ss -i | grep <IP ADDRESS> -A1 | sed '/^--$/d;N;s/\n/ /g'
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Hey thanks, -A1 works perfectly. I don't know where to give the points though since both of you answered at the same time :s – dimas Apr 24 at 1:14
Ps. That sed command does not works as intended (I believe) because of the dashes added by grep in context mode. Try sed '/--/d;N;s/\n/ /' instead. – Sukminder Apr 24 at 1:31
@Sukminder, I missed those. Nice catch. – drs Apr 24 at 1:48
Ah. or sed -e '/^--$/d;N;s/\n/ /' would probably be a good idea. – Sukminder Apr 24 at 1:49
i'll just upvote drs coz sukminder already have a lot of points lol. thanks again – dimas Apr 24 at 3:35

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