Script to read multiple files...

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# 8  
Old 11-13-2013
See post#2.
# 9  
Old 11-13-2013
This one solves a specific problem that matches your vague description.
awk 'NR==FNR {a[$0]; bf=FILENAME; next} ($0 in a) {delete a[$0]; next} {print FILENAME,":",$0,"not in",bf} END {for (i in a) print bf,":",i,"not in any file"}' bigfile f1 f2 f3 f4 f5 f6 f7

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