Unix command list 10 largest files

du -hsx * | sort -rh | head -10

Unix Command file removal recursive

      I have a project checked out from svn a while ago and wanted to revisit the project, but i realized that instead of using svn export i did a svn checkout so the annoying .svn folders where everywhere. Here is the command to remove them recursively.

Before we issue any kind of rm -rf command lets be safe and list all the .svn folders.
$ find . -type d -name .svn


Then we remove those suckers. 
$ find . -type d -name .svn | xargs rm -rf

PostgreSql change password command line

Awww yeah... If we can't remember your postgres db password, we can reset it.

Ubuntu
First we have to switch to postgres user


su - postgres


now we can execute the psql command


psql -d dbname -U postgres; (this allows you to get it o the db)


alter user postgres with password 'newpassword'; (now you can modify the password)