awk print an extra line in output with {print $x}

Question

I searched in the answer with no succes... On RHEL Linux, A first command lists this (I put exactly what I get for those how want to test...):

ps -eaf | grep lsnr | grep -v ' LISTENER ' | grep -v grep
oracle   10258     1  0  2014 ?        01:34:43 /logicielPR1/oracle/product/11.2.0.4/bin/tnslsnr PRXPLO -inherit
oracle   10442     1  0  2014 ?        00:24:30 /logicielTE1/oracle/product/11.2.0.4/bin/tnslsnr TECHIMIO -inherit
oracle   10473     1  0  2014 ?        00:28:50 /logicielTE1/oracle/product/11.2.0.4/bin/tnslsnr TEIAC -inherit
oracle   10566     1  0  2014 ?        00:24:50 /logicielTE1/oracle/product/11.2.0.4/bin/tnslsnr TEIMG -inherit
oracle   14192     1  0  2014 ?        00:22:09 /logicielPR1/oracle/product/11.2.0.4/bin/tnslsnr PROCTM2 -inherit
oracle   27167     1  0  2014 ?        00:19:26 /logicielTE1/oracle/product/11.2.0.4/bin/tnslsnr TEOCTM -inherit
oracle   36854     1  0  2014 ?        00:19:59 /logicielTE1/oracle/product/11.2.0.4/bin/tnslsnr TEANA -inherit
oracle   37235     1  0 May20 ?        00:08:32 /logicielPR1/oracle/product/11.2.0.4/bin/tnslsnr PRCHIMIO -inherit
oracle   45141     1  0 Jun03 ?        00:08:02 /logicielST1/oracle/product/11.2.0.4/bin/tnslsnr PRIACS -inherit
oracle   48241     1  0 Sep25 ?        00:04:39 /logicielPR1/oracle/product/11.2.0.4/bin/tnslsnr PRINL -inherit
oracle   48708     1  0 Sep25 ?        00:03:27 /logicielTE1/oracle/product/11.2.0.4/bin/tnslsnr TEINL2 -inherit

I want to extract the UPPER name (eg:PRXPLO on the first line), so I do:

ps -eaf | grep lsnr | grep -v ' LISTENER ' | grep -v grep | awk -F "${ORA_LISTENER_HEADER}|${ORA_LISTENER_HEADER_UPPER}|tnslsnr " '{print $2}'
PRXPLO -inherit
TECHIMIO -inherit
TEIAC -inherit
TEIMG -inherit
PROCTM2 -inherit
TEOCTM -inherit
TEANA -inherit
PRCHIMIO -inherit
PRIACS -inherit
 {print $2}
PRINL -inherit
TEINL2 -inherit

*Note: In this command, "${ORA_LISTENER_HEADER}|${ORA_LISTENER_HEADER_UPPER}|tnslsnr " will be equivalent to "tnslsnr "

Obviously, the line containing " {print $2} " should not exists, but I can not find where it comes from. I know that I could simply exclude it via a grep, but I would prefer to understand what I do wrong.

Can someone help me on this issue?

Thanks all.

Answer 1

为了缓解问题，只需使用一个awk调用：

ps -eaf | awk '/lsnr/ && !/ LISTENER / {print $(NF-1)}'

Answer 2

Yes, you have to exclude it via grep. awk is a separate process and it is shown in the list of processes you grep by running the whole chain.

ps -eaf | grep lsnr | grep -v ' LISTENER ' | grep -v grep | grep -v awk | awk -F "${ORA_LISTENER_HEADER}|${ORA_LISTENER_HEADER_UPPER}|tnslsnr " '{print $2}'