Comparing two files

[Amit Dixit_2]

Hi I am having two file for which I want to run a compare line by line i.e. I want to extract all lines one by one and run a find on the other file if found ignore else redirect the output to the third file.

Both the files are not sorted.


Thanks,
Amit.

[A. Clay Stephenson]

You should look at diff. Man diff for details.

[Denver Osborn]

so you want to read file1 and while it's read search file2 for that same line? If the line in file1 is not found in file2, then dump it to file3? In other words, pull out the lines that don't repeat when file1 and file2 are combined...

Try uniq.

cat file1 file2 |uniq -u

hope this helps,
-denver

[Vibhor Kumar Agarwal]

Have a look at the man pages of diff and cmp.

Further if you want check for common lines, you can grep

grep -f file1 file2 > file3

In this common lines will go in file3

[vasundhara]

sdiff -l file1 file2

Will give all the common lines in first line.

If a line is present in file1, but not in file2, it is represented with <

If a line is present in file2, but not in file1, it is represented with >

If a line is different in both the files, it is represented with |

man sdiff will give more information.

[Bharat Katkar]

Hi Amit,
Vibhor has got you correct.

# grep -f file1 file2 > file3

This should help.
Regards.
Bharat

[john korterman]

Hi,

# sort file1 file2|comm -3 >file3

may also work.

regards,
John K.