This comes in handy if you're using the terminal in full screen but still want to know your battery life. Just type the following:
upower -i /org/freedesktop/UPower/devices/battery_BAT0
Want to check the specs of your system? Just type this:
lshw
Too long? Then type this for a shorter version:
lshw -short
This comes in handy especially whenever you want to download multiples files from a server or take backups.
zip [option] output_file input1 input2
For example: if you want to zip an entire directory with it's file contents, just do this:
zip -r myfiles.zip folder/