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Forum: Shell Programming and Scripting 12-27-2012

Help with awk, using a file to filter another one

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NF is a special variable that means 'number of...

NF is a special variable that means 'number of columns'. Columns are counted 1,2,...,NF.

So $NF means 'the last column', since $ means 'convert from column number into column'.

Forum: Shell Programming and Scripting 12-27-2012

Help with awk, using a file to filter another one

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For the first file, NR will be identical to FNR,...

For the first file, NR will be identical to FNR, so it will save the id (last column, i.e. $NF ) into the D array as D[651]=1, etc.

Then when NR stops being equal to FNR ( fnr will reset to 1, nr...

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