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Performance issue with fgrep -vf file1 file2>file3

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Top Forums Shell Programming and Scripting Performance issue with fgrep -vf file1 file2>file3
# 8  
Old 08-16-2013
Code:
awk     'NR==FNR        {T[$1$2$3]; next}       # suck in file1 into array T, indexed by $1, $2, $3 concatenated
         ($2$3$4 in T)  {next}                  # if concat. $2, $3, $4 found in T, record existed in file1, read next line, start over      
         1                                      # print the orig. line from file 2, as not in file1
        ' file1 file2

# 9  
Old 08-19-2013
Hi RudiC,

Thanks for your explanation. But got below query.

Code:
awk 'NR==FNR {T[$1$2$3]; next} ($2$3$4 in T) {next} 1' file1 file2

Regarding above code. I just found that if content of file1 is zero then its not working. Ideally even if size of file1 is zero it should return all the content of file2.
# 10  
Old 08-19-2013
Yes. If file1 has zero length, it takes file2 as file1 and has nothing left to work upon.
Try
Code:
awk 'FILENAME==ARGV[1] {T[$1$2$3]; next} ($2$3$4 in T) {next} 1' file1 file2

This User Gave Thanks to RudiC For This Post:
Lakshman_Gupta
# 11  
Old 08-20-2013
PERFECT Thanks RudiC!!!!
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