commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Info about Bluetooth devices.
Advanced information about RAM.
Check SATA controller type.
6.0 Gbps - SATA III
3.0 Gbps - SATA II
1.5 Gbps - SATA I
Replace default command in skype.desktop file.
Install Ksuperkey one command in Kubuntu.
You must manually add ksuperkey to autostart in System Settings KDE.