Shell Programming and Scripting

Hi,

I need to compare two files using shell scripting.
Say like:

File1
AAAAAAAAAAAAAAAAAAAA
BBBBBBBBBBBBBBBBBBBBB
CCCCCCCCCCCCCCCCCCCCCCCCC
eeeeeeeeeeeeeeeeeeeeeeeee
DDDDDDDDDDDDDDDDDDDDDDDDDDDD

File2
BBBBBBBBBBBBBBBBBBBBB
DDDDDDDDDDDDDDDDDDDDDDDDDDDD
AAAAAAAAAAAAAAAAAAAA

output should be:
CCCCCCCCCCCCCCCCCCCCCCCCC
eeeeeeeeeeeeeeeeeeeeeeeee

output should be all lines unique to file1.

I have tried to do this using sort and comm command and it works.
However the problem is that output comes in a sorted manner.
I need to maintain the order in which they appear in file1.
If it can be done using awk, please let me know.
Its kind of urgent.

Thanks,
Rosh

Based on the input given ..

Code:

$ fgrep -vf file2 file1
CCCCCCCCCCCCCCCCCCCCCCCCC
eeeeeeeeeeeeeeeeeeeeeeeee

Code:

grep -v -f file2 file1

https://www.unix.com/shell-programmin...hird-file.html

--ahamed

Hi,

Thanks a lot. At initial glance, it looks to be working.
Let me test some more scenarios.

Btw, how does this work?

Thanks,
Rosh

man grep

--ahamed

Hi,

I know we can give multiple arguments to grep which will then search in all the files (assuming there is no -v option)
what will it do in case i give -f option?

Thanks,
Rosh

grep -v -f file2 file1 - the contents of the file file1 will be used for searching the target file file2 and display the result. -v will invert the search results.

HTH
--ahamed.