* http://www.grymoire.com/Unix/sed.html# ToDo
  * https://learnbyexample.github.io/learn_gnused/breere-regular-expressions.html

==== Sed ====


  sed -n '/^foo/,/^bar/p' /etc/passwd | sed -r '/^(foo|bar)/d' # Print the range of lines between foo and bar w/o foo and bar.


  sed -e "s/rzr/RzR/g" < filein.txt >| fileout.txt
  sed -e "s/rzr/RzR/g" -i fileinout.txt

  echo "    trim   space    " | sed -e "s/^[[ ]]*//g" | sed -e "s/[[ ]]*$//g"

  locate -i -r '\.o$'

Using variables :

  echo $PATH | sed -e "s|$USER|root|g"

http://www.student.northpark.edu/pemente/sed/sedfaq4.html#s4.30

didiwiki put EOF at botom see as "^@" on [[Emacs]], workaround :
  sed -e "s|\x0||g" -i * 


http://www.inrialpes.fr/pop-art/people/girault/Cours/Automates/td3.html

zero or more:
  [[:alnum:]]*

one or more : 
  [[:alnum:]][[:alnum:]]*


  u=http://uuner.doslash.org/forfun/sedtris.sed && wget "$u" &&  u=http://sed.sf.net/grabbag/scripts/playsed.sh.txt && wget "$u" && bash playsed.sh.txt sedtris.sed



==== WTF ====

  * [[sed]] http://libregamewiki.org/Sedtris


===== MORE =====

@TaG: [[regex]]

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