Interesting tip for those using GNU Screen. If you need to scroll up and see output already hidden from the screen, just press
Ctrl + A , [
This will get you into “copy mode”. I didn’t look around for how to actually copy, but you can scroll with the arrow keys.
To get out of copy mode, just press “[” again.
This post has alerted me of a big problem on laptop HDs that apparently happens to Linux users (according to other post from this same author, Vista has the same issue). It seems that the power-saving technologies keep telling the hard drive heads to sleep, while Linux keeps telling the drive to read or write something down. This wake-sleep-wake process consumes the life-time of the drivers to the point of failling hardware within an year.
The current workaround is to shutdown power management to hard disks with hdparm “hdparm -B 254 /dev/sda” (or /dev/hda, depending on your configuration).
More detailed info can be found on Ubuntu Bug at Launchpad.
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If you ever managed more than a few Linux servers, you may have found yourself in a situation where you don’t know which distro a particular server is using. I used to cat /proc/version to get a rough idea. But a friend of mine from work just gave me this tip:
cat /etc/issue
Simple, easy and objective!
Hope this help you out!
