how to compare two text files to get the identical lines

[honglou]

Hi,there.I am asking for help here.I get two text files of products number.I need to compare the 2 files to get the identical products number.

The two files are attached below here.

[mjpatey]

There is a command called "diff" which will show the differences between two files, if that helps at all. The syntax, I believe, is:

diff file1.txt file2.txt

I hope this gets you on track, at least!

[mjpatey]

... also, if you use the -y modifier, it will display the files side by side, which would help you see the similarities.

[honglou]

... also, if you use the -y modifier, it will display the files side by side, which would help you see the similarities.

hi,mjpatey.Thx.And the advice doesn't work for my problem here.

[iponeverything]

cat file1.txt|sed s/\"//g |awk -F\- '{print "grep "$2 " file2.txt"}' |sh >> dups.txt

[mjpatey]

OK. Sorry, gave it my best shot! After some searching, I don't see a command to do exactly what you're asking. But you could try the manpage for diff:

 man diff

and see if any of the options would get you close.

[lovinglinux]

You could use "Meld" from the repositories. It is a very nice GUI diff tool, that highlight different lines from both files.

[honglou]

cat file1.txt|sed s/\"//g |awk -F\- '{print "grep "$2 " file2.txt"}' |sh >> dups.txt

Thank you,iponeverything.I am done with the problem after the command issued.And thank you all.May GNU-Linux be with you.

[honglou]

Thank you,iponeverything.I am done with the problem after the command issued.And thank you all.May GNU-Linux be with you.

hi,iponeverything.Thank you for your nice and kind advice.
And I still get a problem here since I am not famillar with the commands of 'sed' or 'awk'.I want to check out the products number in file2 ,but not in file1 which are products already on the website.So after the comparison,i would update the the website with the missing products.
I wish you would get time and trouble to help me.Thank you in advance!

[iponeverything]

hi,iponeverything.Thank you for your nice and kind advice.
And I still get a problem here since I am not famillar with the commands of 'sed' or 'awk'.I want to check out the products number in file2 ,but not in file1 which are products already on the website.So after the comparison,i would update the the website with the missing products.
I wish you would get time and trouble to help me.Thank you in advance!

Not quite sure what your asking.You need the product numbers uniq to file2?

If that is the case then just do:

diff dups.txt file2.txt| grep \> |sed s/\>//g |sed s/\"//g|awk '{print "\"HJ-"$1"\""}' > uniq-to-file2.txt