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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