Shell Programming and Scripting

I need to find out which lines are in one file and are not in the other file.
Lines in files contain blank spaces as well.

File1:

Code:

some line here
some other line
some third line

File2:

Code:

some other line
some line here

The Result I Wont to get is:

File3:

Code:

some third line

I have done some searching thru the forum and I have found this:

Code:

grep -v -f File2 File1 > File3

That would solve the given example, BUT my files are about 120MB. Performing the opeartion on them results with "memory exousted" error.

I have tried spliting the file to smaller shunks so that every contains 100000 lines (~6MB), then I get two times (for every file) 30 files. That means that i have to make 30x30 operations. First operation that I started 40 min ago is still working..., and I dont expect positive result.

try diff

But diff compares like this:

some line here <-> some other line
some other line <-> some line here
some third line <->

Or?

Code:

diff file1 file2

i hope that will help

one of the ways:

Code:

grep -v -f file2 file1

cmp file1 file2

Loop line by line

Code:

#!/bin/ksh
while read line
do
      grep  "^${line}$"  file2 >/dev/null 2>&1 || echo "not in file2:$line"
done < file1