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How can I get the 3 consecutive appearances of a line?

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# 1  
Old 06-07-2012
How can I get the 3 consecutive appearances of a line?
File 1

aaa
ccc
fff

File 2

aaa
bbb
ddd

File 3

aaa
bbb
eee

File 4

bbb
ggg

Output should be:

aaa
bbb

Thank you.
# 2  
Old 06-07-2012
Your question is not clear and explained. Be clear with you question and use code tag.
# 3  
Old 06-07-2012
Code:
cat file* | sort | uniq -c | head -2

If you dont want you can remove the count
This User Gave Thanks to lorcan For This Post:
Misa-Misa
# 4  
Old 06-07-2012
Quote:
Originally Posted by lorcan
Code:
cat file* | sort | uniq -c | head -2

If you dont want you can remove the count
Thanks for this but I tried it but still it includes the line even it skips a certain file. That is to say,

File 1 - aaa
File 2 - aaa
File 3 - no "aaa"
File 4 - aaa

The output was:

3 aaa

Wherein it should not output the "aaa" because its appearances are not consecutive. Thanks in advance.
# 5  
Old 06-07-2012
How about this..

Code:
awk '{a[$0]++} END { for (i in a) { if (a[i]==3) print i}}' file*


EDIT : Ignore this solution. Doesn't meet the "consecutive" requirement you provided.
This User Gave Thanks to clx For This Post:
Misa-Misa
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