Sed/awk : to grep only required pattern disk

Shell Programming and Scripting
1

Hi Experts,

Need help with the following:

Desired output:
Only want to get the output marked in green.

The file:

--- Physical volumes ---
   PV Name                     /dev/disk/disk4704
   PV Status                   available
   Total PE                    6399
   Free PE                     1
   Autoswitch                  On
   Proactive Polling           On

   PV Name                     /dev/disk/disk4705
   PV Status                   available
   Total PE                    6399
   Free PE                     1
   Autoswitch                  On
   Proactive Polling           On


   --- Physical volume groups ---
   PVG Name                    pvgDBSST001
   PV Name                     /dev/disk/disk4704
   PV Name                     /dev/disk/disk4705
  • The desired output should be below:
    Should be taken from the
--- Physical volumes ---

portion , and not from --- Physical volume groups --- portion .

/dev/disk/disk4704
/dev/disk/disk4705
  • What I am trying :
awk '/PV Name/{print $NF}' file
/dev/disk/disk4704
/dev/disk/disk4705
/dev/disk/disk4704
/dev/disk/disk4705

I am getting 4 entry , 2 from top, 2 from bottom, but I do not want the bottom 2 disk.

Thanks,

---------- Post updated at 07:47 PM ---------- Previous update was at 07:41 PM ----------

Also , how to tell awk to filter the data from first portion only , and not go for searching "PV Name" in the second portion.

How to do a mechanism to search in this portion of data:

--- Physical volumes ---
   PV Name                     /dev/disk/disk4704
   PV Status                   available
   Total PE                    6399
   Free PE                     1
   Autoswitch                  On
   Proactive Polling           On

   PV Name                     /dev/disk/disk4705
   PV Status                   available
   Total PE                    6399
   Free PE                     1
   Autoswitch                  On
   Proactive Polling           On

---------- Post updated at 08:09 PM ---------- Previous update was at 07:47 PM ----------

Solved:
By removing duplicates.

[CODE]awk '/PV Name/{if(A[$NF]++==0) print $NF }'

Thank you all.

2

See if that fits you.

awk '/PV Name/ {if (!a[$NF]++)print $NF}'
1 Like
3

Aia ,
Thank you...

4 
awk '/Physical volume groups/ {f=1} !f && /PV Name/ {print $NF}'
/dev/disk/disk4704
/dev/disk/disk4705