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Using awk

 
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# 8  
Old 05-04-2005
Quote:
Originally Posted by tmarikle
Much nicer, I didn't realize that awk supported associative arrays.

However, If the data file has column headings and any blank lines, you may want to add a filter so you don't get meaningless lines in your output.
Code:
NR > 1 && length($1) > 0 { 
    sum[$1] += $NF 
}

  1. If the line is 'blank' - your output will not change as there's no $1 and the value of $NF is '0' which does not change the value of the 'sum' [if there was one]
  2. It's better to use 'FNR > 1' as you may have multiple input files with headers

The body would be:
Code:
FNR > 1 { sum[$1] += $NF }

little details...... Smilie
# 9  
Old 05-04-2005
Quote:
Originally Posted by vgersh99
little details...... Smilie
Cool, I have only recently started to utilize awk's considerable power so this is useful information.

Thanks for pointing out the little details.

Thomas
# 10  
Old 05-04-2005
I want to thank all of you. Just being new to the world of awk, I really appreciate all of the help. This has pointed me in the right direction, and I should be able to wrap this up today. May every lotto ticket you buy be a winning one!

Thanks,

Jonmon
# 11  
Old 05-05-2005
This is really helpful in understanding the power of awk and nawk Smilie Smilie
 
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