(gawk.info.gz) Getline/Variable

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 4.9.2 Using `getline' into a Variable
 -------------------------------------
 
 You can use `getline VAR' to read the next record from `awk''s input
 into the variable VAR.  No other processing is done.  For example,
 suppose the next line is a comment or a special string, and you want to
 read it without triggering any rules.  This form of `getline' allows
 you to read that line and store it in a variable so that the main
 read-a-line-and-check-each-rule loop of `awk' never sees it.  The
 following example swaps every two lines of input:
 
      {
           if ((getline tmp) > 0) {
                print tmp
                print $0
           } else
                print $0
      }
 
 It takes the following list:
 
      wan
      tew
      free
      phore
 
 and produces these results:
 
      tew
      wan
      phore
      free
 
    The `getline' command used in this way sets only the variables `NR'
 and `FNR' (and of course, VAR).  The record is not split into fields,
 so the values of the fields (including `$0') and the value of `NF' do
 not change.
 

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