Install a list of packages from a text file.

cat packages.txt | xargs apt-get install

Replace one string by another in all file found by find.

find . -name *whatyouwant* -exec perl -pi.bak -e 's/TEXT_TO_REPLACE/TEXT_TO_REPLACE_IT_WITH/g' {} \;

You can use Aspell to spell check of a text document using this command. It must be executed in a termial – as it has an console interface.

aspell check test.txt

Original Article

Grep that searches recursively, ignores binary files, and doesn’t look inside Subversion hidden folders.

grep -Ir --exclude="*\.svn*" "pattern" *

Delete all \n chars in a file…

tr -d "\n"