[solved] Difference Between Two Files

Okay, so I have been trying to use diff to do this, but I am failing, as this isn't code I am looking at (and I'm not really a programmer).
I have two text files with a single line per entry (which is a userid). I need to be able to compare the two files, and output only the userid's that don't show up in one of the files.
Example:
File 1 File 2
a a
b s
c c
d t
So the output would be simply s and t.
Can I use diff to do this? If not, can someone maybe hack up a quick Perl script or something? I know there has to be a better way than going through a 2000+ userid file by hand.
Thanks!
Last edited by lifeafter2am (2010-08-27 16:19:53)

yes, use comm.
but just for fun:
//blue/0/~/ cat file1
a
b
c
d
//blue/0/~/ cat file2
a
s
c
t
//blue/0/~/ grep -Fxv "$(< file1)" file2
s
t

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Difference between two files

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Suppose you have two arrays filled with integers.
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Jeff Bohrer wrote:
Basic math gives me a bit of pause on this approach. You are sampling at 50 times the frequency of interest so you get 50 samples per cycle. your phase resolution is 1/50th cycle or 7.2 degrees +/- noise. You will need to samlpe faster to reduce phase resolution or average multiple readings (at a time cost that is signifigant)
Jeff- (Hardly Working)
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F. Schubert wrote:
I'm not a signal processing expert, but here my basic understanding.
If you simulate sampling with 5kHz and a frequency of 50 Hz (and both are 'sync' by design), you always get an exact 5 periods. Any variation of your signals frequency gives you a propability to get 4 or 6 'trigger' events. That's an up or down of 20%!
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www.aescusoft.de
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An interesting view. the sine wave can indeed be looked as a second harmonic of the square wave. I will implement your idea and get back to you as soon as I get some results. But since I have very limited knowledge of signal processing, it might take me a while to get my hear around the solution you mentioned.

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>
RAGHAV URAL wrote:
> how can i see the difference between two interal tables?
> The requirement is as follows
>
> 1. We have a transparent table, which stores the employee data with EMP ID as key.
> 2. We load the transp table data into a interal table (B).
> 3. We get data from legecy system as file and it gets loaded into another internal table (A) (this also has the same EMP ID key and this will have latest addition/update to those emplyees).
>
> Now we need to seperate out these data into three interal table Inserted (I), Deleted (D) and Updated (U).
>
> We want to do followign things
> I = A - B
> D = B - A
>
> Both A and B will have around 40k records. Hence we are trying to avoid the looping.
>
> Please suggest the best option for us.
>
> Thank you in advance.
> Raghavendra
Hi Raghavendra,
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Regards,
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Need to Get this wave.JPG ‏34 KB

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Go to Solution.

pinkman wrote:
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Thanx friends for all your efforts
I have a sample code for the same,this will compare the two tables for single row in each table .
what r the modification needed for the multiple rows of values in the two tables??
Please suggest!!
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[solved] Difference Between Two Files

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