How to display line numbers in side by side diff in unix?

Below code can be used display uncommon fields in two files, side by side.

sdiff -l file1 file2 | cat -n | grep -v -e '($'

Below code will display common fields along with line numbers in the output.

diff -y file1 file2 | cat -n | grep -v -e '($'

file unix diff sdiff

sdiff -s <(cat -n file1.txt) <(cat -n file2.txt)

This gives you side-by-side output with line-numbers from the source files.

file unix diff sdiff

The following command will display the side-by-side output prepended with line numbers for file1.txt and identical lines removed.

sdiff -l file1.txt file2.txt | cat -n | grep -v -e '($'

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