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Thank you,iponeverything.You helped me a lot.Thanks again!
Nice wishes to you.
:guitar:

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...

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

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

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.

Thank you!It's clear now.:)
"May the source be with you!":)
And thank you for your nice wishes.:lolflag:

Hi,iaculallad.Thanks a lot.
I agree you.Guess the shell is not quite logically defined.But I do appreciate the shell language.I am learning the shell recently.And it's great.

And I get a new...

Hi,iaculallad!
It's ok while thinking your way.But what confusing me is about the operation order there.Let's see.

While commanding "ls > ls_result",I guess the order would be:
1."ls" to tell...

Hello.
I am getting a problem while testing the command below:

ls > ls_result.txt

I checked the file ls_result.txt and found there was a line of "ls_result.txt" there.I am confused.And my...