Hi
I need to modify entire file starting from the 3 line. file looks like this
filename : exp
first line
second
1,"wes","est","ws"
1,"was","qwe","qwa"
also i have to replace the third content from 3 line by a counter . so the output should look like this:
first line
second
1,"wes","1","ws"
1,"was","2","qwa"
here 1, 2 is a type of incrementing counter ...
please help 
try..
awk -F, '{x=x+1} {print $1","$2","x","$4}' file
nawk 'BEGIN{n=1;OFS=FS=","}NR>=3{$3=sprintf("\"%s\"",n);n++;print;}'
awk -F, '{x=x+1} {print $1","$2","x","$4}'
This gives output :
first line,,1, second,,2,
1,"wes",3,"ws"
1,"was",4,"qwa"
,,5,
it alters first 2 lines as well...
---------- Post updated at 05:42 AM ---------- Previous update was at 05:38 AM ----------
the first 2 lines got missed out ...
1,"wes","1","ws"
1,"was","2","qwa"
,,"3"
i have tried replacing the 3 column with sed and awk .. its working ...
my problem boils down to
how to copy first 2 lines of a file and only alter the remaining lines 3rd column ? i have to store this modified file in some other file ....
This should do the trick:
awk -F, 'NR>2{$3="\042"++c"\042"}1' OFS="," file
will this work?
awk -F, 'NR<3 {print $0}; NR>=3 {x=x+1; print $1","$2","x","$4}' <file>
THIS IS PRINTING AN ADDITIONAL THIRD LINE ...
first line
second
1,"wes",1,"ws"
1,"was",2,"qwa"
,,3,
i think it will work .. but can make me understand the logic ?
---------- Post updated at 06:01 AM ---------- Previous update was at 05:59 AM ----------
also the file i m using , i m not certain of the number of fields it will have ... i mean it is not necessarily 4 ...
Shorter 
awk '{FS=OFS=","}NR>2{$3="\""++c"\""}1' file
awk -F, 'NR>2{$3="\042"++c"\042"}1' OFS="," file
this is too giving me an additional line first line
second
1,"wes","1","ws"
1,"was","2","qwa"
,,"3"
in the end ...
---------- Post updated at 06:06 AM ---------- Previous update was at 06:04 AM ----------
awk '{FS=OFS=","}NR>2{$3="\""++c"\""}1' file
again the same probs ...
first line
second
1,"wes","1","ws"
1,"was","2","qwa"
,,"3"
Is it possible that you have a blank line at the end of your file?
the input file cannot be changed :
Try this:
awk '! NF{next}{FS=OFS=","}NR>2{$3="\""++c"\""}1'
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thanks it works ...
