topic Re: Comparing two files in hp-ux in Operating System - Linux

Comparing two files in hp-ux

vvsha — Thu, 21 Feb 2008 12:38:58 GMT

Hi,

I am trying to compare two files in hp-ux using diff command.

but I am not getting the proper output.

The following command I am using to find out what is in the
second file but not in the first file.

# diff file1.txt file2.txt | sed -e 's//file2content/'

Can anyone help me on this.

Is there any other command to achive the same goal?

Re: Comparing two files in hp-ux

Peter Nikitka — Thu, 21 Feb 2008 12:45:32 GMT

Hi,

the diff does the comparation - right?
It seems, you want to something more - what?

The 'man diff' gives you options for modifying output or even (-e') generates ed-commands to create file2 from file1.

See 'man sdiff' for a side-by-sside diff.

mfG Peter

Re: Comparing two files in hp-ux

James R. Ferguson — Thu, 21 Feb 2008 12:47:30 GMT

Hi:

You probably want to use 'comm(1)'. See the manpages for more information.

Regards!

...JRF...

Re: Comparing two files in hp-ux

Ivan Krastev — Thu, 21 Feb 2008 12:48:21 GMT

Use grep:

grep -vf file1 file2

regards,
ivan

Re: Comparing two files in hp-ux

harry d brown jr — Thu, 21 Feb 2008 12:57:59 GMT

What is the proper output you expect?

and what output are you receiving?
and what inputs are you using?

live free or die
harry

Re: Comparing two files in hp-ux

vvsha — Thu, 21 Feb 2008 14:35:53 GMT

I have two files and both the files has some data inside, and some of the data are similer also.

I want to find out what is the data in the first file which is not present in the second file.

Is there any way to find out?

Please help me on this

Re: Comparing two files in hp-ux

F Verschuren — Thu, 21 Feb 2008 14:42:41 GMT

is this wat you like:
sort -n file1.txt > 1
sort -n file2.tx1 > 2
diff 1 2 |grep ^"<"

Re: Comparing two files in hp-ux

harry d brown jr — Thu, 21 Feb 2008 15:40:37 GMT

Like JRF pointed out the comm command:

comm -3 file1.txt file2.txt

Provided both files are sorted.

live free or die
harry

Re: Comparing two files in hp-ux

Arturo Galbiati — Fri, 22 Feb 2008 07:40:39 GMT

Hi,
sort file1 -o file1.sorted
sort file2 -o file2.sorted
grep vf file1.sorted fle2.sorted
HTH,
Art

Re: Comparing two files in hp-ux

Dennis Handly — Fri, 22 Feb 2008 10:34:35 GMT

As others have mentioned, you can use comm(1) or grep -vf to find all lines in the second but not the first.

>harry: comm -3 file1.txt file2.txt

A slight correction, comm -13 will only print the lines from file 2.

>Arturo: sort file1 -o file1.sorted

I'm not sure why you want to sort the files unless you want to use comm(1)? You may want to use sort -u, if you don't want to see you have N lines (all the same) not in file1.

Note: Using sort (twice) and comm would be faster than grep -v, if you have 10s of thousands of lines.

Re: Comparing two files in hp-ux

Elmar P. Kolkman — Fri, 22 Feb 2008 12:22:05 GMT

There is a slight problem with the grep solution: if you have a line in file1 containing a subset of a line in file2, it will still skip the line in file2.

Example:
file1 contains a line consisting of a single '1'
Then all lines containing a '1' in file2 are skipped.

comm handles this better.
Also: mind that you want to find data in file1 that's not in file2. Meaning you want to do it the other way around: skip lines in file 1 that's not in file2.

A solution for the grep problem is to create a temporary file, containing all lines from file2 with a ^ prepended and a $ appended to each line.

Or use the -w flag for grep.

Re: Comparing two files in hp-ux

Dennis Handly — Fri, 22 Feb 2008 23:25:58 GMT

>Elmar: There is a slight problem with the grep solution
>Or use the -w flag for grep.

Oops, right. The -x flag compares the entire line. Unfortunately it still looks at patterns so you need fgrep:
fgrep -xvf file1 file2