Filter lines common in two files Post: 302830445

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Top Forums UNIX for Dummies Questions & Answers Filter lines common in two files Post 302830445 by Don Cragun on Monday 8th of July 2013 10:25:10 PM

07-08-2013

Registered User

Quote:

Originally Posted by latsyrc

Thanks everyone. I got that problem solved.

I require one more help here. (Yes, UNIX definitely seems to be fun and useful, and I WILL eventually learn it for myself. But I am now on a different project and don't really have time to go through all the basics. So, I will really appreciate some help.)

I've got two data files.
One has: ID lat lon data1 data2; for ex:

Code:

1001   23.5  -6.45  3.2  14.68
1002   48.2  -35.6  8.5  21.67
1003   -5.6   23.6   3.5  3.56
...
...

And the other has: ID data3 data4 data5
For example:

Code:

1001   C   16   US
1002   D    32   US
1004   E    13   US
...
...

There are approximately 2500 IDs but neither has all of them. file1 has few missing, so does file2, but the missing IDs are not necessarily common.

Now I want to make a new file with: ID lat lon data4 ; but ONLY for the IDs that are common in both.
So, for above files it would be:

Code:

1001   23.5  -6.45  16
1002   48.2  -35.6  32
...
...

I searched the forums and there are similar problems which are solved using awk but I could not comprehend the scripts well enough to create my own solution.
Thanks.

You really should start a new thread when you have a new problem... It makes it a lot easier for people who may try to read this thread later figure out what problem later messages in the thread are trying to address.

Assuming that the above two input files are named datfile3 and datfile4, respectively, and that you want the output stored in a file named output; the following simple awk script seems to be a little more direct than Just Ice's proposal:

Code:

awk '
FNR == NR {
	d4[$1] = $3
	next
}
($1 in d4) {
	printf("%s   %s  %s  %s\n", $1, $2, $3, d4[$1])
}' datfile4 datfile3 > output

When you run this script with the above sample input files, the contents of output will be:

Code:

1001   23.5  -6.45  16
1002   48.2  -35.6  32

which matches the spacing you requested.

As I mentioned before, if you want to run this on a Solaris system, use /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk instead of /usr/bin/awk or /bin/awk.

Don Cragun

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