How to fit the terminal/console results on the screen?

<Your command> | less

Example

ps ax | less

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Using this tip we can prevent the output results of our command scroll down to the end. Or, we can fit the results to the screen and pressing Enter see rest of the results

How to change the keyboard layout for the console (Ctrl+Alt+F1)?

1-Go to the console

Press Control+Alt+F1, for example

2-Install the console-common package

sudo apt-get install console-common

3-Follow the instructions and choose your new keyboard layout
4-Test the new layout

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 To reconfigure your keybout layout run

sudo dpkg-reconfigure console-common

This tip is useful to us keyboard for foreign users.Users that have pipeline (|) missing can emulate it using this tip too.

Check KDE version by terminal

kded4 --version

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If not works, try:

kded --version

How to change the brightness (backlight) on Linux by terminal?

xbacklight -set <value>

Example

xbacklight -set 20.0

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See the man for more options

 man xbacklight

How to change the constrast by terminal on Linux?

xgamma -gamma <value>

Example

xgamma -gamma 0.6

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Gamma values must be between  0.100 and 10.000
See the man too

$man xgamma

How to change the system volume by terminal on Linux?

amixer set Master <volume>

Example

amixer set Master 20

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See the manual to another helpfull parameters

$man amixer