need to grab field from prevous line

[cp2000]

I am trying to grab information from the output of the mailq(postfix) Command. The problems is......The search criteria is on line 2 and the information (message ID) is on line 1. I searched and found several multiple line posts but none that quite cover this. It looks something like.

F0E413FBB 7462 Tue Oct 19 10:52:42 george@internet.com
(connect to mail.hisnet.com[66.11.222.120]: server dropped connection without sending the initial greeting)
george@hisnet.com

 

[PHV]

What have you so far ?
Can you please post more input samples and, obviously, expected result ?

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ222-2244

 

[futurelet]

I don't know what you're looking for in the second line; let's use "dropped connection" as an example:

/dropped connection/ { print prev_line "\n" $0 }
{prev_line = $0}

 

[cp2000]

here is the script so far:
--------
#!/bin/bash
mailq | tail +2 \
| gawk -F" " ' /.*isnet.com/ { print $1 }' -
--------

The input looks like:
--------
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
43CFE3F82 1298 Tue Oct 19 12:23:35 support@internet.com
(connect to mail.ofnet.com[1.1.1.1]: Connection timed out)
george@ofnet.com

F0E413FBB 7462 Tue Oct 19 10:52:42 george@internet.com
(connect to mail.hisnet.com[66.11.222.120]: server dropped connection without sending the initial greeting)
george@hisnet.com
--------
The output I'm getting is:
--------
george@hisnet.com

--------
The output I'm looking for is
--------
F0E413FBB
--------

 

[PHV]

something like this ?
mailq | gawk '/isnet\.com/{print s;next}{s=$1}'

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ222-2244

 

[futurelet]

It will simplify things if we make the record separator a blank line:
[tt]
mailq | gawk 'BEGIN{RS=""} /isnet\.com/ { print $1 }'
[/tt]

 

[cp2000]

PHV - yours was almost there
-------
F0E413FBB
F0E413FBB
-------
futurelet -that works - THNX