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Old 02-22-2012, 05:26 AM   #1
dann_radkov
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grep for common patterns in 2 files


Hey Guys,
I have two files with items.
A-txt file /is the output of yum listavaiable/ has extracted all the files from a repo of an RHEL6 . I modified them so now i have only the rpm names. I cut lose all the version/release/platform part.
B-txt file /is again the output of yum listavailable/ but for RHEL5.6. I modified the list so now i have only the rpm names. I cut lose all the version/release/platform part.

I need to use grep to produce a list & make sure all items present in B file(or the old image we used to have) and also present in A file get outputted to a C file.
This way I can basically define what I need in the new image and cut loose the rest of the stuff.
Please let me know if you have suggestions.
 
Old 02-22-2012, 05:49 AM   #2
syg00
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"man comm"
 
Old 02-22-2012, 06:19 AM   #3
dann_radkov
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Ok looks justified. I sorted them beforehand and did a
comm -1 -2 Afile Bfile(as fas as i understand it doesnt matter which you will put first) > Cfile.txt
Sound about right ?
 
Old 03-05-2012, 01:57 AM   #4
dann_radkov
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Ok Just confirmed it doesnt work in my case.Some files from list A are not necessarily present in list B.I cannot do a comm -1 -2 .Please elaborate.
 
Old 03-05-2012, 02:19 AM   #5
Dark_Helmet
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Quote:
Originally Posted by dann_radkov
Some files from list A are not necessarily present in list B.
That contradicts your earlier statement:

Quote:
Originally Posted by dann_radkov
I need to use grep to produce a list & make sure all items present in B file(or the old image we used to have) and also present in A file get outputted to a C file.
If the file is not listed in A, then you don't want it according to the original post.

If the requirements have changed, that's fine. But, you haven't explained how the requirements have changed. We can't help with a solution if you don't provide those requirements.
 
Old 03-05-2012, 03:42 AM   #6
singhjc
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Hi,

First get determine what do you want actually.
 
Old 03-07-2012, 02:52 AM   #7
dann_radkov
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I need to use grep to produce a list & make sure all items present in B file(or the old image we used to have) and also present in A file get outputted to a C file.
This way I can basically define what I need in the new image and cut loose the rest of the stuff.
Please let me know if you have suggestions.

I also realized i was using comm with a wrong syntax
i was doing
#comm -1 -2 Afile Bfile > Cfile
whereas I should be doing
#comm -12 Afile Bfile > Cfile
 
Old 03-07-2012, 03:51 AM   #8
Dark_Helmet
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Ok, something is not "translating well."

You want a list of lines listed in both fileA and fileB.

The command you gave in your last reply will do that.

For example:
Code:
user@localhost$ cat fileA
package 1
package 2
package 3
package 4
package 5
package 6
user@localhost$ cat fileB
package 1
package 4
package 6
package 7
package 8
user@localhost$ comm -1 -2 fileA fileB
package 1
package 4
package 6
user@localhost$ comm -12 fileA fileB
package 1
package 4
package 6
user@localhost$ cat fileA fileB | sort | uniq -d
package 1
package 4
package 6
The last command is an alternative to comm.

To me, that satisfies your requirements. If the command is not producing the desired output on your end, then (1) the description of the requirements needs to be refined or (2) your data files are not "sanitized" (e.g. dos2unix, extra whitespace, mismatched lower/uppercase letters, etc.)

We would need to see real, actual sample data and the output you're getting.
 
  


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