List of random tips

They can be distro specific, unspecific, cryptic, easy to read. It doesn't matter. Instead of scribbling your tips on a personal file, dump them here.

• To find more info about the USE flags of package X: emerge gentoolkit && equery uses X
• Find info about any media file : emerge mplayer add to ~/.bashrc : idmedia(){ mplayer -identify -frames 0 -ao null -vo null -vc dummy "$@" 2>/dev/null | grep ID_