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Full Discussion: Find specific pattern and change some of block values using awk
Top Forums Shell Programming and Scripting Find specific pattern and change some of block values using awk Post 303025094 by alex2005 on Wednesday 24th of October 2018 08:58:03 AM
Old 10-24-2018
Find specific pattern and change some of block values using awk
Hi,

Could you please help me finding a way to replace a specific value in a text block when matching a key pattern ?

I got the keys and the values from a command similar to:

Code:
echo -e "key01 Nvalue01-1 Nvalue01-2 Nvalue01-3\nkey02 Nvalue02-1 Nvalue02-2 Nvalue02-3 \nkey03 Nvalue03-1 Nvalue03-2 Nvalue03-3" 
key01 Nvalue01-1 Nvalue01-2 Nvalue01-3
key02 Nvalue02-1 Nvalue02-2 Nvalue02-3 
key03 Nvalue03-1 Nvalue03-2 Nvalue03-3

The file which contains the text blocks is similar to:

Code:
cat file1 
[key00]
fieldA = value00
fieldB = value00B
fieldC = value00C
[key01]
fieldA = value01 
fieldB = value01B
fieldC = value01C
[key01-new]
fieldA = value01
fieldB = value01B
fieldC = value01C
[key02]
fieldA = value02
fieldB = value02B
fieldC = value02C
filedX = textstring
[key02-new]
fieldA = value02
fieldB = value02B
fieldC = value02C
[key-03]
fieldA = value03
fieldB = value03B
fieldC = value03C
[key03-new]
fieldA = value03
fieldB = value03B
fieldC = value03C
filedH = somevalue
[key05]
fieldA = value04
fieldB = value05B
fieldC = value05C
filedD = othervalue  
[key06]
fieldA = value06
fieldB = value06B
fieldC = value06C

I want to replace fieldA fieldB and fieldC values for the keys:key01-new key02-new and key03-new .


Desired output should be similar to:

Code:
[key00]
fieldA = value00
fieldB = value00B
fieldC = value00C
[key01]
fieldA = value01 
fieldB = value01B
fieldC = value01C
[key01-new]
fieldA = Nvalue01-1
fieldB = Nvalue01-2
fieldC = Nvalue01-3
[key02]
fieldA = value02
fieldB = value02B
fieldC = value02C
filedX = textstring
[key02-new]
fieldA = Nvalue02-1
fieldB = Nvalue02-2
fieldC = Nvalue02-3
[key-03]
fieldA = value03
fieldB = value03B
fieldC = value03C
[key03-new]
fieldA = Nvalue03-1
fieldB = Nvalue03-2
fieldC = Nvalue03-3
filedH = somevalue
[key05]
fieldA = value04
fieldB = value05B
fieldC = value05C
filedD = othervalue  
[key06]
fieldA = value06
fieldB = value06B
fieldC = value06C

Below is what I have tried so far, but as you can see is not working very well.
Key matching works, and presume in order to have a single iteration, I need to read keys and values into an array, and I'm afraid this is beyond my capabilities.

Code:
echo -e "key01 Nvalue01-1 Nvalue01-2 Nvalue01-3\nkey02 Nvalue02-1 Nvalue02-2 Nvalue02-3 \nkey03 Nvalue03-1 Nvalue03-2 Nvalue03-3"  | while read k1 v1 v2 v3 ; do awk -v key=$k1 -v vl1=$v1 -v vl2=$v2 -v vl3=$v3  '/\[.*\]/ {if ($0 ~ key"-new") replace=1; else replace=0;} {if (replace && $1 == "fieldA" ) $3=vl1 ; else if (replace && $1 == "fieldB" ) $3=vl2 ; else if (replace && $1 == "fieldC" ) $3=vl3 ;}1' file1 ; done

Code:
[key00]
fieldA = value00
fieldB = value00B
fieldC = value00C
[key01]
fieldA = value01 
fieldB = value01B
fieldC = value01C
[key01-new]
fieldA = Nvalue01-1
fieldB = Nvalue01-2
fieldC = Nvalue01-3
[key02]
fieldA = value02
fieldB = value02B
fieldC = value02C
filedX = textstring
[key02-new]
fieldA = value02
fieldB = value02B
fieldC = value02C
[key-03]
fieldA = value03
fieldB = value03B
fieldC = value03C
[key03-new]
fieldA = value03
fieldB = value03B
fieldC = value03C
filedH = somevalue
[key05]
fieldA = value04
fieldB = value05B
fieldC = value05C
filedD = othervalue  
[key06]
fieldA = value06
fieldB = value06B
fieldC = value06C

[key00]
fieldA = value00
fieldB = value00B
fieldC = value00C
[key01]
fieldA = value01 
fieldB = value01B
fieldC = value01C
[key01-new]
fieldA = value01
fieldB = value01B
fieldC = value01C
[key02]
fieldA = value02
fieldB = value02B
fieldC = value02C
filedX = textstring
[key02-new]
fieldA = Nvalue02-1
fieldB = Nvalue02-2
fieldC = Nvalue02-3
[key-03]
fieldA = value03
fieldB = value03B
fieldC = value03C
[key03-new]
fieldA = value03
fieldB = value03B
fieldC = value03C
filedH = somevalue
[key05]
fieldA = value04
fieldB = value05B
fieldC = value05C
filedD = othervalue  
[key06]
fieldA = value06
fieldB = value06B
fieldC = value06C

[key00]
fieldA = value00
fieldB = value00B
fieldC = value00C
[key01]
fieldA = value01 
fieldB = value01B
fieldC = value01C
[key01-new]
fieldA = value01
fieldB = value01B
fieldC = value01C
[key02]
fieldA = value02
fieldB = value02B
fieldC = value02C
filedX = textstring
[key02-new]
fieldA = value02
fieldB = value02B
fieldC = value02C
[key-03]
fieldA = value03
fieldB = value03B
fieldC = value03C
[key03-new]
fieldA = Nvalue03-1
fieldB = Nvalue03-2
fieldC = Nvalue03-3
filedH = somevalue
[key05]
fieldA = value04
fieldB = value05B
fieldC = value05C
filedD = othervalue  
[key06]
fieldA = value06
fieldB = value06B
fieldC = value06C

Thanks is advance.
 

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