The Zoltan Blog

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1) Open the sudoers file safely:
visudo command edits the sudoers file in a safe fashion.
Attention: you can only run visudo as root
This is a vi editor. Here are some basic vi commands:
To enter vi insert mode: i
To enter vi command mode: [esc]
To exit vi and save changes: ZZ or :wq
To exit vi […]

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There are a few different ways to restart SSHD remotely.
You will need root access in order to do this.
1) /etc/init.d/sshd restart
2) kill `cat /var/run/sshd.pid` && /usr/sbin/sshd

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It is a good idea to disable root login for security purposes and use your login name and use sudo to get root privileges.
First of all, make sure you have your own login name and you can get root privileges by using sudo.
So, open up /etc/ssh/sshd_config and comment out
AllowUsers root
so it will look like:
#AllowUsers admin
You […]

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Command: lsof -p processID
Example: lsof -p 4048
More info, source: http://forum.ensim.com/showthread.php?t=18798

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du -sxch home/* for subfolders of home
more:
http://community.livejournal.com/linux/1685214.html

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/usr/sbin/useradd -g groupname username
more info here

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wget
Example: wget http://wilmer.gaast.net/downloads/axel-1.0b.tar.gz

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cd /usr/tom
chown -R tom:group *

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