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UGU: Unix Guru Universe - Unix Tip #4308- December 27, 2012 - Home : Help : Today's Tip
Unix Tip #4308- December 27, 2012

REMOVING BLANK LINES


To remove blank lines from a file using sed, use the following:

sed -e '/^$/d' filetoread >filetowrite

The ^ matches the beginning of a line and the $ matches the end.
The two of them together matches a line that begins and ends with
nothing in between (blank line).
The d just says delete the lines for which we have a match.
Since the standard operation of sed is to print every line,
all lines exept blank lines will be sent to filetowrite.


This tip generously supported by: code@ionet.net

NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted by various unix admins around the globe. UGU suggest you read and test each tip in a non-volitile environment before placing into production.


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