dpkg -l @	 package 	 Find version of a package
df -h	 	 file system disk space usage
free -m	 	 show RAM usage
ps auxww | grep @	 process 	 displays information about the active process
iwconfig	 	 Display wireless network information
ifconfig -a	 	 displays the status of the currently active interfaces
sudo iwlist	 	 scan Scan Wireless networks
sudo /etc/init.d/networking restart	 	 Reset the Network
lsb_release -a	 	 What version of Ubuntu do I have?
uname -a	 	 What kernel am I running
sudo apt-get update && sudo apt-get upgrade	 	 Refresh update info and update all packages
sudo apt-get clean	 	 clear out all packages in /var/cache/apt/archives
sudo apt-get autoclean 	 	 clear out obsolete packages(packages with a newer release)
apt-cache search @ 	package 	 Find information on a package (not installed)
sudo lshw 	 	 List hardware
lspci 	 	 list all PCI devices
aplay -l 	 	 List all soundcards and digital audio devices
cat @ 	path	 Read File & Print to Standard Output
ls @ 	path 	 List Folders Contents
ls -lSr @ 	path 	 Show files by size, biggest last
mv @ 	path 	 Move (Rename) Files
cp @ 	path 	 Copy Files
sudo lspci 	 	 attached PCI devices
chmod @ @ 	 permissions, file 	 Change access permissions, change mode
chown @ @	 owner	group, file 	 Change the owner and/or group of each given file
dmesg 	 	 Print kernel & driver messages
history 	 	 Command History
locate @ 	 file 	 Find files (updatedb to update DB)
sudo updatedb 	 	 update the database for locate
which @ 	command 	 Show full path name of command
find -maxdepth 1 -type f | xargs grep -F @ 	string 	 Search all regular files for 'string' in this dir
gpg -c @ 	file 	 Encypt a file
gpg @ 	file.gpg 	 Decrypt a file
tar -xjf @ 	archive.tar 	 Extract all files from archive.tar
tar -czf @ 	Destination.tar.gz  Source 	 Create Destination from Source
iostat 	 	 cpu and I/O statistics
netstat 	 	 Print network connections and interface statistics
sudo fdisk -l @ 	disk 	 List partition tables for specified devices
sudo ufw enable 	 	 Enable netfilter firewall
sudo ufw allow @ 	port 	 Open a port in netfilter firewall
sudo ufw deny @ 	port 	 Close a port in netfilter firewall
sudo ufw disable 	 	 Disable netfilter firewall
cat @ @ | sort | uniq > @ 	 file1, file2, file3 	 combine, sort and remove duplicates from 2 files
mkisofs -V LABEL -r dir | gzip > @ 	isoname.iso.gz 	 Create cdrom image from contents of directory
cdrecord -v dev=/dev/cdrom -audio -pad *.wav 	 	 Make audio CD from all wavs in current dir
dpkg-query -W -f='${Installed-Size;10}\t${Package}\n' | sort -k1,1n 	 	 List all installed packages by size
tail -f /var/log/messages 	 	 Monitor messages log file
apropos @ 	command/package 	 search the manual page names and descriptions