Grep the lines in one file that are also in another


 
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# 1  
Old 09-30-2014
Grep the lines in one file that are also in another

Hi all,
I have two files.
File A looks like this:

Code:
abkhasian	com|hum
accent	com|com|com|com|sta
acceptation	act|com|sta
adventures 	com|hum
adversity	com|hum|hum

and File B looks like this:

Code:
adventure
adventures
adversary
Adverse
adversity

I want to print those lines in File A in which the value in Column 1 also appears in File B.

Thus, the desired output would be to print those lines from File A:

Code:
adventures 	com|hum
adversity	com|hum|hum

I know there is a grep that does the opposite of that:
Code:
grep -F -x -v -f fileB fileA

But, is there a way to modify it so that I can reach my desired output?
Thank you
# 2  
Old 09-30-2014
Quote:
Originally Posted by owwow14
Hi all,
I have two files.
File A looks like this:

Code:
abkhasian    com|hum
accent    com|com|com|com|sta
acceptation    act|com|sta
adventures     com|hum
adversity    com|hum|hum

and File B looks like this:

Code:
adventure
adventures
adversary
Adverse
adversity

I want to print those lines in File A in which the value in Column 1 also appears in File B.

Thus, the desired output would be to print those lines from File A:

Code:
adventures     com|hum
adversity    com|hum|hum

I know there is a grep that does the opposite of that:
Code:
grep -F -x -v -f fileB fileA

But, is there a way to modify it so that I can reach my desired output?
Thank you
Hello owwow14,

Here is an awk approach for same.

Code:
awk 'FNR==NR{A[$1]=$0;next} ($1 in A){print A[$1]}' fileA fileB

Output will be as follows.

Code:
adventures      com|hum
adversity       com|hum|hum

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
# 3  
Old 09-30-2014
Code:
awk 'FILENAME=="FileA" {arr[$1]++; next}
       FILENAME=="FileB" {if($1 in arr) {print $1} }' FileA FileB >output

awk works well for this
# 4  
Old 09-30-2014
Code:
awk 'FNR==NR{A[$1];next}$1 in A' FileB FileA

# 5  
Old 09-30-2014
Quote:
Originally Posted by Akshay Hegde
Code:
awk 'FNR==NR{A[$1];next}$1 in A' FileB FileA

Hello Akshay,

I think you need to assign the value to A[$1]=$0. As it will give only the first column of fileB.
Code:
awk 'FNR==NR{A[$1]=$0;next} ($1 in A){print A[$1]}' fileA fileB

Thanks,
R. Singh
# 6  
Old 09-30-2014
Quote:
Originally Posted by RavinderSingh13
Hello Akshay,

I think you need to assign the value to A[$1]=$0. As it will give only the first column of fileB.
Code:
awk 'FNR==NR{A[$1]=$0;next} ($1 in A){print A[$1]}' fileA fileB

Thanks,
R. Singh
Could you please explain me Mr.RavinderSingh13 why I need to assign the value unnecessarily ? I read FileB first not FileA please look into the post.

Thanks by the way Smilie
This User Gave Thanks to Akshay Hegde For This Post:
# 7  
Old 09-30-2014
Quote:
Originally Posted by Akshay Hegde
Could you please explain me Mr.RavinderSingh13 why I need to assign the value unnecessarily ? I read FileB first not FileA please look into the post.
Hello Akshay,

I got your point. Thank you for explaining me same.

Thanks,
R. Singh

Last edited by RavinderSingh13; 09-30-2014 at 11:13 AM.. Reason: Deleted old contents and edited it as understood Akshay's point, thanks to Akshay
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