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Old 10-08-2008
radoulov's Avatar
radoulov radoulov is online now Forum Staff  
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Join Date: Jan 2007
Location: Варна, България / Milano, Italia
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The standard solution will hold the entire file1 in memory:

Code:
awk>file3 'NR==FNR{_[$1];next}$1 in _' file1 file2