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extract same word from two files

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Operating Systems AIX extract same word from two files
# 1  
Old 04-06-2008
extract same word from two files
file1 contains:
3

file2 contains:
1
2
3
.
.
20000

cat file1 | while read line
do
grep -s $line file2 >> file3
done

my result file3 shows:
3
3
3
3
3
3

it should only show 3 only once in file3
# 2  
Old 04-06-2008
maybe you can pipe the output to "sort -u" so you only get a unique output. hope this is what you want?

cheers,
DN2
# 3  
Old 04-06-2008
i added | sort -n file2 > file3.sort, same result.
# 4  
Old 04-06-2008
sort -u, worked !
# 5  
Old 04-06-2008
Code:
grep -f file1 file2 > file3
cat file3
3

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