Non printing option in sed is behaving oddly Post: 303036672

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Top Forums UNIX for Beginners Questions & Answers Non printing option in sed is behaving oddly Post 303036672 by Paul Walker on Sunday 7th of July 2019 12:59:41 PM

07-07-2019

Registered User

Non printing option in sed is behaving oddly

Hi I'm having a problem with a sed command that I thought I was using correctly but apparently that's not the case.

I was hoping someone here could point out what it is I am doing wrong?
I am using the print, no print option for a matched pattern in sed. Everything seemed to be working fine except I noticed that some lines that were matching my pattern are missing from my output.

After doing a little digging I found that after the command matched a pattern, if the next line also matched the pattern it would fail to output the second matched pattern line.
Can any one see why its behaving this way?
Below is the command I am using

Code:

sed -n -e '/\<PreviousJobNum\>[A-Z]*[0-9][0-9]*[A-Z]*\<\/PreviousJobNum\>/{p;n;}' /MyInputFile > /MyOutPutFile

The file I am reading in is MyInputFile, the content of which is

Code:

<PreviousJobNum>93296</PreviousJobNum>
<PreviousJobNum>95879D</PreviousJobNum>

When I run the above command my output in MyOutPutFile is

Code:

<PreviousJobNum>93296</PreviousJobNum>

If I change the data slightly in the original MyInputFile to have line between the two matched pattern lines, like below,

Code:

<PreviousJobNum>93296</PreviousJobNum>


<PreviousJobNum>95879D</PreviousJobNum>

Then my output Picks up both matched pattern lines in the MyOutPutFile as below.

Code:

<PreviousJobNum>93296</PreviousJobNum>
<PreviousJobNum>95879D</PreviousJobNum>

I suppose I could double space my input file to get around this but I think it would be better to understand why its behaving this way?
if anyone was able to offer some assistance with this I would be very grateful.
Thank you very much
Paul

Last edited by Scrutinizer; 07-07-2019 at 10:24 PM.. Reason: Removed hyperlink

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