* Login
* logout / exit / <ctrl+d>
* clear / <ctrl+l>
* reboot / poweroff
* passwd
* Virtual Terminals: Alt-F1, Alt-F2, ...
* Shift-PgUp, Shift-PgDn
* ssh client / putty
* ls -lha
* pwd
* Home Directory
* mkdir / rmdir
* cd / cd .. / cd - / cd ~
* touch
* file
* Reuse previous commands
* Using TAB for completion
* Relative / Absolute Addresses
* Redirection: send output to a file or read a file as standard input to a command 
* echo "string" > filename
* rm -i -rf
* cp -i -rv
* mv -i
* alias / unalias
* wild cards * ?
* cat / more / less
* head / tail -f
* ln -s
* man
* Shell Variables (SHELL, HOME, PATH)
* which / type / enable -a
* find
* locate / updatedb
* grep
* ps -A / kill / killall
* Piping: pass standard output as standard input to another command
* chown , /etc/passwd
* chmod
* date, cal / unix timestamp
* uptime / free