diff to show differed lines only (hiding common lines)

BauV · Aug 25, 2021

hi,

I am comparing 2 TXT files, each one has millions of rows, to know the differed rows.
How can I hide common rows in the resultant files? please help.

My command: diff -u -w <sort file1) <(sort file2) > file3.res
My file1:
a1 Bala
a2 vup
a3 jivup

My file2:
a1 Bala
a2 Vup
a3 jivup
b1 abc

file3.res from present command:
a1 Bala
a3 jivup
-a2 vup
+a2 Vup
+b1 abc

O/p file that I want to see

hide all common rows, show only differed rows)
-a2 vup
+a2 Vup
+b1 abc

Cheers,
BauV

feherke · Aug 25, 2021

Hi

I am afraid this works only in GNU [tt]diff[/tt], but give it a try :

Code:

diff --unchanged-line-format= --old-line-format='-%L' --new-line-format='+%L' <(sort file1) <(sort file2) > file3.res

Feherke.
feherke.github.io

BauV · Aug 26, 2021

Thanks Feherke, for your suggestion.
Unfortunately it's not working, my Linux 5.10 says "...illegal option -- unchanged-line-format=".

Even "diff file1.txt file2.txt |grep -E ’<|>’ > outputfile.txt" also says "....illegal option -- E..".
Any further suggestion is appreciable.

Cheers,
BauV

BauV · Aug 26, 2021

hi,

This one worked for me excluding the lines that start with 1 space.
diff file1.txt file2.txt |grep -v '^ ' > outputfile.txt

Cheers,
BauV

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diff to show differed lines only (hiding common lines)

BauV

Technical User

feherke

Programmer

BauV

Technical User

BauV

Technical User

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