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file comparing script

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# 1  
Old 01-06-2011
file comparing script
Hi Guys,

I need a help in putting a script which compares 2 files which has some names on it. I would like to compare both the files and put the common ones in another file, could anyone help me how to do that?

Also I want to do the same for 3 files also? I am a beginner in the scripting and any help would be greatly appreciated.

Regards,

RR
# 2  
Old 01-06-2011
Look at man comm
comm
This User Gave Thanks to anurag.singh For This Post:
rrb2009
# 3  
Old 01-06-2011
Thanks So much. It just works as what i was expecting for 2 files. Thanks for letting me know this command.

But I am unable to use 3 files. is there anyway I can compare 3 files ?

ex :

File 1
******
a
b
c
d

File 2
*******
a
c
d

File 3
******
a
b
c
d


Output :
********
a
c
d
# 4  
Old 01-06-2011
There is a EXAMPLES section in man page of comm.
That has exactly what you want. Get common data for 3 files.
Idea is, pipe the output of 2 files to the 3rd file.
Pls try. If you get further problem, will give the command.
This User Gave Thanks to anurag.singh For This Post:
rrb2009
# 5  
Old 01-06-2011
Code:
grep -f <(grep -f file1 file2 ) file3

This User Gave Thanks to rdcwayx For This Post:
rrb2009
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