Sed - An Introduction and Tutorial by Bruce Barnett

Removing comments and blank lines takes two commands. The first removes every character from the "#" to the end of the line,and the second deletes all blank lines:

sed -e 's/#.*//' -e '/^$/ d'

A third one should be added to remove all blanks and tabs immediately before the end of line:

sed -e 's/#.*//' -e 's/[ ^I]*$//' -e '/^$/ d' 

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