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Update program providing a functionality on Debian
On Debian systems, choose which command provides java. Works for all alternatives listed in /etc/alternatives.

List manually installed packages (excluding Essentials)

Using numsum to sum a column of numbers.
if you, like me, do not have the numsum, this way can do the same.

clear screen, keep prompt at eye-level (faster than clear(1), tput cl, etc.)
this leaves the cursor at the bottom of the terminal screen, where your eyes are. ctrl-l moves it to the top, forcing you to look up.

pretend to be busy in office to enjoy a cup of coffee
This will turn it in an infinite loop and also shows random words from a file, so it won't be the same each time and also not just a number.

Copy ssh keys to user@host to enable password-less ssh logins.
To generate the keys use the command ssh-keygen

Get first Git commit hash
git log --format=%H | tail -1 doesn't work anymore

open two files side by side in vim (one window, two panes)

nmap fast scan all ports target

Get the weather forecast for the next 24 to 48 for your location.
This shell function grabs the weather forecast for the next 24 to 48 hours from weatherunderground.com. Replace <YOURZIPORLOCATION> with your zip code or your "city, state" or "city, country", then calling the function without any arguments returns the weather for that location. Calling the function with a zip code or place name as an argument returns the weather for that location instead of your default. To add a bit of color formatting to the output, use the following instead: $weather(){ curl -s "http://api.wunderground.com/auto/wui/geo/ForecastXML/index.xml?query=${@:-}"|perl -ne '/([^


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