Check if a file contains an exact match string from another file using grep

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1
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I have two files : file1 and file2. The content of both files is the following



  • file1: Hello

  • file2: Bla bla bla bla Hello Bla Bla bla bla bla

My objective is to see if I can find an exact match of Hello in file2.



I used the following command: grep -F -f file1 file2. As output I get Bla bla bla bla Hello Bla Bla bla bla bla.



But suppose I change Hello in file1 to just "H" and I run the grep command again
; I also get as output Bla bla bla bla Hello Bla Bla bla bla bla.



What can I do in order to solve that problem and search only for an exact match?




grep




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  • 2




    You are getting an exact match. If you want to match a complete word, use -w with grep.
    – Kusalananda
    Jul 4 at 14:02














up vote
1
down vote

favorite












I have two files : file1 and file2. The content of both files is the following



  • file1: Hello

  • file2: Bla bla bla bla Hello Bla Bla bla bla bla

My objective is to see if I can find an exact match of Hello in file2.



I used the following command: grep -F -f file1 file2. As output I get Bla bla bla bla Hello Bla Bla bla bla bla.



But suppose I change Hello in file1 to just "H" and I run the grep command again
; I also get as output Bla bla bla bla Hello Bla Bla bla bla bla.



What can I do in order to solve that problem and search only for an exact match?




grep




share|improve this question

















  • 2




    You are getting an exact match. If you want to match a complete word, use -w with grep.
    – Kusalananda
    Jul 4 at 14:02












up vote
1
down vote

favorite









up vote
1
down vote

favorite











I have two files : file1 and file2. The content of both files is the following



  • file1: Hello

  • file2: Bla bla bla bla Hello Bla Bla bla bla bla

My objective is to see if I can find an exact match of Hello in file2.



I used the following command: grep -F -f file1 file2. As output I get Bla bla bla bla Hello Bla Bla bla bla bla.



But suppose I change Hello in file1 to just "H" and I run the grep command again
; I also get as output Bla bla bla bla Hello Bla Bla bla bla bla.



What can I do in order to solve that problem and search only for an exact match?




grep




share|improve this question













I have two files : file1 and file2. The content of both files is the following



  • file1: Hello

  • file2: Bla bla bla bla Hello Bla Bla bla bla bla

My objective is to see if I can find an exact match of Hello in file2.



I used the following command: grep -F -f file1 file2. As output I get Bla bla bla bla Hello Bla Bla bla bla bla.



But suppose I change Hello in file1 to just "H" and I run the grep command again
; I also get as output Bla bla bla bla Hello Bla Bla bla bla bla.



What can I do in order to solve that problem and search only for an exact match?





grep





share|improve this question












share|improve this question




share|improve this question








edited Jul 5 at 0:05









Jeff Schaller

30.8k846104




30.8k846104









asked Jul 4 at 13:55









Hani Gotc

554




554







  • 2




    You are getting an exact match. If you want to match a complete word, use -w with grep.
    – Kusalananda
    Jul 4 at 14:02












  • 2




    You are getting an exact match. If you want to match a complete word, use -w with grep.
    – Kusalananda
    Jul 4 at 14:02







2




2




You are getting an exact match. If you want to match a complete word, use -w with grep.
– Kusalananda
Jul 4 at 14:02




You are getting an exact match. If you want to match a complete word, use -w with grep.
– Kusalananda
Jul 4 at 14:02










1 Answer
1






active

oldest

votes

















up vote
2
down vote



accepted










You can add those two arguments:




  • -w Matches only word/words instead of substring


  • -o Display only matched pattern instead of whole line

So command will be:



grep -ow -F -f file1 file2


First exemple will output:



Hello


Second one won't output anything since there is no exact match found.






share|improve this answer























  • The second example would not output anything as there is no H word in the data.
    – Kusalananda
    Jul 4 at 14:11










  • You're right. Corrected. Thanks
    – Kevin Lemaire
    Jul 4 at 14:11











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1 Answer
1






active

oldest

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1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
2
down vote



accepted










You can add those two arguments:




  • -w Matches only word/words instead of substring


  • -o Display only matched pattern instead of whole line

So command will be:



grep -ow -F -f file1 file2


First exemple will output:



Hello


Second one won't output anything since there is no exact match found.






share|improve this answer























  • The second example would not output anything as there is no H word in the data.
    – Kusalananda
    Jul 4 at 14:11










  • You're right. Corrected. Thanks
    – Kevin Lemaire
    Jul 4 at 14:11















up vote
2
down vote



accepted










You can add those two arguments:




  • -w Matches only word/words instead of substring


  • -o Display only matched pattern instead of whole line

So command will be:



grep -ow -F -f file1 file2


First exemple will output:



Hello


Second one won't output anything since there is no exact match found.






share|improve this answer























  • The second example would not output anything as there is no H word in the data.
    – Kusalananda
    Jul 4 at 14:11










  • You're right. Corrected. Thanks
    – Kevin Lemaire
    Jul 4 at 14:11













up vote
2
down vote



accepted







up vote
2
down vote



accepted






You can add those two arguments:




  • -w Matches only word/words instead of substring


  • -o Display only matched pattern instead of whole line

So command will be:



grep -ow -F -f file1 file2


First exemple will output:



Hello


Second one won't output anything since there is no exact match found.






share|improve this answer















You can add those two arguments:




  • -w Matches only word/words instead of substring


  • -o Display only matched pattern instead of whole line

So command will be:



grep -ow -F -f file1 file2


First exemple will output:



Hello


Second one won't output anything since there is no exact match found.







share|improve this answer















share|improve this answer



share|improve this answer








edited Jul 4 at 14:12


























answered Jul 4 at 14:02









Kevin Lemaire

1,039421




1,039421











  • The second example would not output anything as there is no H word in the data.
    – Kusalananda
    Jul 4 at 14:11










  • You're right. Corrected. Thanks
    – Kevin Lemaire
    Jul 4 at 14:11

















  • The second example would not output anything as there is no H word in the data.
    – Kusalananda
    Jul 4 at 14:11










  • You're right. Corrected. Thanks
    – Kevin Lemaire
    Jul 4 at 14:11
















The second example would not output anything as there is no H word in the data.
– Kusalananda
Jul 4 at 14:11




The second example would not output anything as there is no H word in the data.
– Kusalananda
Jul 4 at 14:11












You're right. Corrected. Thanks
– Kevin Lemaire
Jul 4 at 14:11





You're right. Corrected. Thanks
– Kevin Lemaire
Jul 4 at 14:11













 

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