This snippet removes all non-empty lines containing
only whitespace, but I don't think that's particularly
intuitive behaviour. If I want to remove all "blank"
lines from a file, I probably want:
perl -i.bak -ne 'print if /\S/' file.txt
and if I want to get rid of all the lines with
"useless" whitespace, I probably want to collapse them
to empty lines:
perl -i.bak -ne 's/^\s+$//;print' file.txt
Update: Changed first one-liner
to Ovid's for readability.
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