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Remove duplicate consecutive lines with specific string

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Top Forums Shell Programming and Scripting Remove duplicate consecutive lines with specific string
# 1  
Old 07-26-2017
Quote:
Originally Posted by Mannu2525
Able to do it using
Code:
sed '/WARNING/N;/^\(.*\)\n\1$/!P; D' File.txt

This is really tricky.
With a Unix sed you also have the strange behavior that N exits without a default print, if it's on the last line (i.e. fails); the usual work-around is $!N.
Also many Unix sed need { and } (and lables) on separate lines or separate -e arguments.
Code:
sed -e '/^WARNING/{' -e '$!N;/^\(.*\)\n\1$/!P;D' -e '}' File.txt

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