[SOLVED] which lines are identical in the two files

torito · 06-02-2016, 09:03 AM

Hi everyone!

I am trying to write a command to find out which lines are identical in the two files.
I come up with grep -f file1 file2 > newfile

The problem is when I open newfile, it is empty. There is nothing there.

Any suggestions, please?

Thank you very much!

weibullguy · 06-02-2016, 09:26 AM

Your command works for me. Maybe file1 and file2 have no lines in common.

torito · 06-02-2016, 09:31 AM

Ummm.... interesting. I typed using vi an exact line in both files, but that line is not shown in the newfile.

ntubski · 06-02-2016, 09:45 AM

Does file1 have any special characters in it? (e.g. ".", "*", "\", "[", "]", etc)

You should use -F (fixed strings, rather then regexps)

Code:

grep -Ff file1 file2 > newfile

grail · 06-02-2016, 09:52 AM

You could also try looking at the comm command.

torito · 06-02-2016, 10:08 AM

Thank you everyone!!!!!!!!!!!!!!!!!!!