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search and replace in csv file

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Top Forums Shell Programming and Scripting search and replace in csv file
# 15  
Old 02-27-2012
Quote:
Originally Posted by dondilip
Sorry man I dont have nawk package..Can I use awk instead?
Even the awk works, but I want the output to be only the ones which are replaced not all the entries,,Is it possible?
# 16  
Old 02-27-2012
i am not clear. post some sample data and the expected output.
you want to replace only the first occurance in the row as well ?
Code:
 
$ awk -F, -v OFS="," '{if(a==0 && $2=="5004"){$2="1010";a=1;print}else{print}}' test.txt
9788691010,1010,20120120002804,
9705645060,5004,20120120004753,
9014961516,1000,20120120004809,
9014961516,5004,20120120004809,
9014961516,1000,20120120004809,
9014961516,1000,20120120004809,
 
$ cat test.txt
9788691010,5004,20120120002804,
9705645060,5004,20120120004753,
9014961516,1000,20120120004809,
9014961516,5004,20120120004809,
9014961516,1000,20120120004809,
9014961516,1000,20120120004809,

# 17  
Old 02-27-2012
Input file

919925623336,1,2011-07-11T23:33:31.000+05:30,
919099951769,2,2011-07-11T23:34:48.000+05:30,
918306699170,2,2011-07-11T23:32:20.000+05:30,

output File expected

919099951769,1,2011-07-11T23:34:48.000+05:30,
918306699170,1,2011-07-11T23:32:20.000+05:30,


I want only the output with only the entries which are replaced and not the other entries which are not replaced.

Thanks..

sorry for the confusion..
# 18  
Old 02-27-2012
Code:
$ awk -F, -v OFS=, '$2==2{$2=1;print $0}' test.txt
919099951769,1,2011-07-11T23:34:48.000+05:30,
918306699170,1,2011-07-11T23:32:20.000+05:30,

# 19  
Old 02-27-2012
Quote:
Originally Posted by itkamaraj
Code:
$ awk -F, -v OFS=, '$2==2{$2=1;print $0}' test.txt
919099951769,1,2011-07-11T23:34:48.000+05:30,
918306699170,1,2011-07-11T23:32:20.000+05:30,

Works perfectly....bye for now

---------- Post updated at 05:21 PM ---------- Previous update was at 03:48 PM ----------

Hi Kamaraj,

I actually run the awk on multiple files..and export the output to one big file. Is there a way where I can run awk and export the output to same file on which the awk is running.

Regards,
# 20  
Old 02-27-2012
awk
Hi,

Try this,

Code:
awk -F, -v OFS=, '$2==2{$2=1;a[NR]=$0;}END{for(i=1;i<=NR;i++){print a[i] >FILENAME;}}' input_file

FILENAME - give you the input file name.

Cheers,
RangaSmilie
This User Gave Thanks to rangarasan For This Post:
dondilip
# 21  
Old 02-28-2012
Quote:
Originally Posted by rangarasan
Hi,

Try this,

Code:
awk -F, -v OFS=, '$2==2{$2=1;a[NR]=$0;}END{for(i=1;i<=NR;i++){print a[i] >FILENAME;}}' input_file

FILENAME - give you the input file name.

Cheers,
RangaSmilie
In my case the the input_file will like *.csv then also will it work?
Last edited by dondilip; 02-28-2012 at 01:05 AM.. Reason: change
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