Using awk over 2 files?


 
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# 1  
Old 06-14-2012
Using awk over 2 files?

Hi,
I wanted to do a check of each record in file 1 against all the records in file 2 to find matches (or not)

so as sudo code would be something like

Code:
awk 
'{
loop through each record of file 2
            if $1.file1 == $3.file2 then
                       do xyz
            else
                       do abc
}' file 1

How can I do this in awk??? (would prefer a simple scripted approach as above rather than a one liner that I probably wont understand!)
# 2  
Old 06-14-2012
Typically an associative array would be used for that, if the files are not too massive:
Code:
awk '
  NR==FNR{
    A[$1]
    next
  } 
  { 
    if(A[$3] in A) {
      do xyz 
    }
    else {
      do abc 
    }
  }' file2 file1


Last edited by Scrutinizer; 06-14-2012 at 09:09 AM..
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