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Thanks a lot.... I got the proper output..

Thank you Mr.Rangarasan,
But the above code lists the fields even if they have the same value in both fields...
i.e here since in both files "lang" is "eng" only, this lang should not be given in...

Hi I have 2 files:
file1.txt
a.ID|1
a.name|ga
a.lang|eng
a.reg|north
a.ID|3
....file2.txt
a.ID|1
a.name|ju
a.lang|eng
a.reg|east
a.ID|2
....The expected o/p is
ID|field|old|new...

@Yoda Thanks for posting the code.... Its works good..
But what if the no. of fields (columns) and their names are unknown!?
How to achieve a generalized script which compares 2 files according to...

Thank you @Yoda....
But I used the segment with awk in your other post in my code as below ... That worked fine too.. Thanks a lot


join -t"," -1 1 -2 1 -a1 file1.csv file2.csv | awk -F, ' BEGIN...

Its a small part in my intern project.... I m quiet new to unix shell scripting... so need the help...

(say) I have 2 csv files - file1.csv & file2.csv as mentioned below:
file1.csv
ID,version,cost
1000,1,30
2000,2,40
3000,3,50
4000,4,60
...

(say) I have 2 csv files - file1.csv & file2.csv as mentioned below:

file1.csv
ID,version,cost
1000,1,30
2000,2,40
3000,3,50
4000,4,60

...