Re^2: removing empty lines

Ok thank you! So tr does not do all regexp metachars such as \d \D \s 
+\S \w \W?

is \s+ is whitespace, why didn't s/^\s+|\s+$//g work on these empty li
+nes?

So \S is non-whitespace so essentially it is ???
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Re^3: removing empty lines by MonkE (Hermit) on May 18, 2007 at 19:22 UTC
Your substitute command is only operating on a single line. After it has removed all characters from the line, you are still left with a blank line. The "next if blank" approach works best for removing unwanted lines in my opinion.	[reply]
Re^3: removing empty lines by swampyankee (Parson) on May 19, 2007 at 01:05 UTC
/^\s+$/ or /\s+$/ matches one or more whitespace characters; neither will match an empty line, i.e., one consisting solely of a newline (as would a line printed by `print "\n";`) won't be matched. emc Insisting on perfect safety is for people who don't have the balls to live in the real world. —Mary Shafer, NASA Dryden Flight Research Center	[reply]