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Full Discussion: Finding features a test file
Top Forums Shell Programming and Scripting Finding features a test file Post 302576867 by dshcs on Sunday 27th of November 2011 08:03:47 AM
Old 11-27-2011
If you are working with a shell script, try the join command. It takes two sorted input files and outputs an SQL like result that joins selected fields from records with matching keys. Take the first file and "roll up" the three line groups to individual lines. Join the second file to this result. Join has options to output non-matched lines as well as matching lines so you can find the "null" results. The key issue can get a little tricky, so I usually construct a key in front of the lines being joined that is extracted/built from the line content.
 

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