sed + need to remove each line in file that begin with ###

How to remove line that begins with three #

For example need to delete all the following lines: from file

1 ### bla bla bal

2 ###blablabla

开发者_StackOverflow3 ### blabla

. . .

THX Yael

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cat file | sed '/^###/d'

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you can use awk as well

awk '!/^[ \t]*###/' file