=== Replace a word ===

<code bash>
$ echo "I like Ruby" | sed 's/like/love/'
I love Ruby
</code>

<code bash>
$ sed 's/python/Ruby/' best_programming_language.txt
</code>

=== Remove a line containing specific string from a file ===

Output will actually go to another file, but this should be ok in most cases:

<code bash>
sed '/BINARY/d' sogo.marek_dump.sql > sogo.marek_dump.no_binary.sql
</code>

=== Replace a line in a file ===

This will replace each occurance of ''yourhostname'' with ''dignum.de'':

<code bash>
sed -i 's/yourhostname/sogo\.dignum\.de/g' /etc/apache2/conf.d/SOGo.conf
</code>

=== Remove certain line from all files in a directory ===

Works with OSX sed.

<code bash>
sed -i '' /extend/d ../core/lib/monkey_patch/*.rb
</code>

=== Guides ===

  * http://www.gentoo.org/doc/en/articles/l-sed1.xml
  * http://www.grymoire.com/unix/sed.html