Delete adjacent duplicate rows

notepad++ Delete adjacent duplicate rows
Find (. +?) (\ r \ n) \1 replaced by \1

SED delete duplicate rows
Sed-nr ' 1h;1! h;${x;s/(. +) (\ n) \1/\1/g;p} ' Num.txt
-N Quiet mode, before SED reads the next line, it will print the contents of the pattern space to the standard output,-n cancels the printing.
-R supports extended regular expressions
1h;1! H Put all the lines in the reserved space
The last line is processed on the last line, then the contents of the pattern space and the reserved space are exchanged, and the regular expression replaces the adjacent duplicate rows. SED does not seem to support ignoring quantifier precedence, temporarily indeterminate.

awk Delete duplicate rows

Delete adjacent duplicate rows