Shell Programming and Scripting

Great aigles !!

Thank you very much. This is what I was looking for.

But frankly I didn't understand the code. Could please explain why we are puting line=line $0. Are you concatinating the previous value of line with the present value?

Again one more problem I face in this code is that if the number of records in the source file becomes more than 5000, then I am getting the error
Segmentation fault(coredump)
in AIX.

Thanks,
Rony

awk 'substr($0,length($0)) == "," {print substr($0,1,length($0)-1) substr($0,length($0)) != "," {print $0}' <filename>

This code have a missing "}". I guess it should be like this
awk 'substr($0,length($0)) == "," {print substr($0,1,length($0)-1)} substr($0,length($0)) != "," {print $0}' filename
Correct me if I am wrong.

The ouput i get here is like this
1
2
3
4
5
But this is not what I want. I have to the get the output as
1,2,3,4,5

Another solution without concatenation :

Code:

awk '
NR==1 {         # Memorize first record whitout printing it
   line = $0;
   next;
}
{                  
   printf("%s",line); # Print previous record without ending Line Feed
   line=$0              # Memorize current record
} 
END {
   sub(/,$/,"",line);  # Remove trailing "," on last record
   print line            # Print last record
}
' input_file > output file

Another solution wiyhout awk :

Code:

sed '$s/,$//' < input_file | tr -d '\n'> output_file

In that case, the output file is not ending with a line feed.
You can add it :

Code:

echo >> output_file

awk 'NR > 1 {print l} {l=$0} END {sub(/,$/,"",l);print l}' <filename>

Great aigles !!
Both the code suggested by you is working fine and is excatly what I wanted. I tried this with a huge input file and still it's able to handle it without any errors.

Thank you very much aigles .

Thanks rajeeb_d for your help.
Your code is also giving the ouput for a large input file but the problem is that it is not putting the output in a single line. The output is coming as
1,
2,
3,
4,
5
Whereas my requirement is to get the output as
1,2,3,4,5

Once again thanks to all who have taken time and effort to help me out.

Regards,
Rony