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removing blank newlines using sed.

Filed under General Life by Chris Ganderton

• 

• June 27, 2008 at 1:32 pmleE

  link

  It’s actually faster to do this:

  tr -d ‘\n’

  Quick demo for you:

  $ time (cat *.txt | sed -e ‘/^$/d’ >> /dev/null)

  real 0m0.016s
  user 0m0.018s
  sys 0m0.001s

  $ time (cat *.txt | sed -e ‘/^$/d’ >> /dev/null)

  real 0m0.016s
  user 0m0.018s
  sys 0m0.001s

  $ time (cat *.txt | tr -d ‘\n’ >> /dev/null)

  real 0m0.010s
  user 0m0.011s
  sys 0m0.001s

  $ time (cat *.txt | tr -d ‘\n’ >> /dev/null)

  real 0m0.009s
  user 0m0.011s
  sys 0m0.001s

  It should also leave a smaller memory footprint:

  $ ls -lah `which tr`
  -r-xr-xr-x 1 root wheel 18K May 10 11:53 /usr/bin/tr
  $ ls -lah `which sed`
  -r-xr-xr-x 1 root wheel 33K May 10 11:53 /usr/bin/sed

  Every byte counts

• 

• July 28, 2008 at 1:14 amJack Wallenberg

  link

  Your are Great. And so is your site! Awesome content. Good job guys!