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Full Discussion: Unexpected result from awk
Top Forums UNIX for Beginners Questions & Answers Unexpected result from awk Post 303015419 by Don Cragun on Wednesday 4th of April 2018 03:23:10 PM
Old 04-04-2018
Quote:
Originally Posted by uniran
Hello,

Giving those commands:

Code:
cat > myfile 
1 
2 
3 
^D 
cat myfile | awk '{ s=s+$1 ; print s}'

The output is:

Code:
1
3
6

It seems like this command iterates each time on a different row so $1 is the first field of each row.. But what caused it to refer to each row ?.
What I mean is, how it knows that for the second iteration for example, $1 should be the first field of the second row rather then the first field of the first row again ?
Because:
  • that is the way awk is described to work,
  • there are no loops in your code to cause an input line in your file to be evaluated more than once,
  • if awk was designed to only process the 1st line in a file (instead of processing each line in a file), it wouldn't be able to process multi-million line input files,
  • et cetera.
What in the description of awk on your system made you think that awk should only process the first line in a file?
 

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