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Full Discussion: awk repeat one field at all lines and modify field repetitions
Top Forums Shell Programming and Scripting awk repeat one field at all lines and modify field repetitions Post 302955582 by phaethon on Friday 18th of September 2015 08:51:45 PM
Old 09-18-2015
awk repeat one field at all lines and modify field repetitions
Hello experts

I have a file with paragraphs begining with a keeping date and ending with "END":

Code:
20120301 num num
John        num num A keepnum1 num num
kathrin     num num A keepnum1 num num
kathrin     num num B keepnum2 num num
Pete        num num A keepnum1 num num
Jacob       num num A keepnum1 num num
Jacob       num num B keepnum2 num num
END
20111203 num num
Eva        num num A keepnum1 num num
Adam       num num A keepnum1 num num
Adam       num num B keepnum2 num num       
Jacob      num num A keepnum1 num num
Jacob      num num B keepnum2 num num
END
...

where "num"=random number that will be discarded, keepnum=keeping random number
What I want is
1. to repeat the date in all lines of each paragraph before keepnum1
2. to take the B keepnum2 of each duplicate name and place it in the first accuring line.
So that the output would look like:
Code:
John        A 20120301 keepnum1 
kathrin     A 20120301 keepnum1  B keepnum2 
Pete        A 20120301 keepnum1 
Jacob        A 20120301 keepnum1  B keepnum2 
END
20111203 
Eva        A 20111203 keepnum1 
Adam      A 20111203  keepnum1  B keepnum2       
Jacob     A 20111203 keepnum1 B keepnum2 
END
....

I have only managged to take the dates with the following command
Code:
 awk ' {RS="END"}; {print $1};'

But with no further luck. Any suggestions? (OS Opensuse)
 

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