Jeremy's questions

I'm trying to script an install which needs luarocks and a couple of rocks installed.

After: sudo apt-get -y install luarocks

But before I relog, If I try: luarocks install loadcaffe

I get

Error: Your user does not have write permissions in /usr/local/lib/luarocks/rocks
-- you may want to run as a privileged user or use your local tree with --local.

And if I try either of these two:

luarocks --local install loadcaffe
sudo luarocks install loadcaffe

I get:

Error: No results matching query were found.

After relogging, this works as expected:

luarocks install loadcaffe

I've tried both source ~/.bashrc and running torch-activate directly, neither fix the problem.

Also tried:

• bash -c luarocks install loadcaffe,
• screen luarocks install loadcaffe

I have an application installed which can make use of my CUDA graphics card, but I'm not sure if I have it configured correctly. Is there a way to check the graphics card activity (throughput, power draw, anything which will tell me if it is being utilised)?

Possible Duplicate:
How can I physically identify a single drive in a RAID array?

I have a computer with several drives in it, all identical, all part of a RAID. One of those drives is failing (sdc), but I can't tell which physical drive is sdc... any suggestions?

It seems like xt (xtraceroute) has been dropped from the repository, does anyone know of another graphical traceroute program in the main repos which draws maps? If not, then a loose deb package will do, or a PPA.

I've got an entry for an external harddrive in my fstab:

UUID="680C0FE30C0FAAE0" /jgdata ntfs noatime,rw

But sometimes this drive isn't plugged in at boot time. This leaves me half way through a boot, with a prompt to "Continue Waiting, press S or press M" but no keypress has any affect at this stage (including Ctrl-Alt-Delete, not even caps-lock).

Short of writing a script to check the output of fdisk -l, how can I mount this drive at boot time only if it is present? It would be handy to have an fdisk entry for this drive, so I can just type mount /jgdata instead of needing a device name.

I know there is a benchmark in the Disk Utility app, but I need something with a few more options. Some of my USB Drives are exhibiting weird results which may be due to testing patterns etc, so some test options would really help me out (chunk size, flush buffer on every write, test size, data pattern / access pattern)

Any suggestions?

Possible Duplicate:
Why is defragmentation unnecessary?

I've been told that EXT file systems don't need to be defreagged because of the way they handle writes. Is this true? Would I benefit from a defrag every now and then? If so, what tools are best?

Does anyone know of an RSS reader for linux which will cache the pages that are linked to in the stories? Really handy for travellers who are often out or wifi range.

When I try to "Import Filmroll" into Darktable, I can't see how to tell it to include all subdirectories. Any tips?

I have an existing install of Ubuntu 10.10, I have installed using ext4 as my filesystem. I want to change to btrfs.

1) Is this sane? If a reinstall is really the only sane way to do this, please let me know.

2) What is the safest way to do this?

I have enough space on the HDD to create another partition of equal size to the root partition and copy over the data, but will I have to make any changes in /etc or anywhere else?

Thanks.

I have had Crossover Games (also called CX Games) recommended to me as a time-saver for installing Windows-native games on Linux. I have also come across another package called Cedega. These apps make it easier to run games by supplying the correct Wine settings, and in the case of Cedega, actually making changes to the compatibility layer (I.e. it does not simply use Wine as a back-end).

Cedega charges an ongoing subscription fee, which really rubs me up the wrong way, whereas CX Games is a one-off payment which entitles you to any future upgrades (please correct me if I'm wrong on that point).

If you have used these packages, did they save you time / headaches getting games running, could you run games which were impossible / very hard to run straight through wine?

EDIT: As pointed out by JanC PlayOnLinux is also available, a free front-end for Wine which includes some profiles for games. I was unfairly mentally lumping this in with Wine.

Does Ubuntu One look for sources of files it needs to download on the LAN before it goes off and grabs them from the cloud? I live in Australia, and we have download limits here, so I'm nervous that having Ubuntu One installed on a few computers could burn my available downloads pretty fast.

I know it is possible to get around this with rsync, but if I'm doing that, I don't really need Ubuntu One, and it is likely that Ubuntu One will realise there have been changes much faster than my cron jobs will.

I have a cron job which runs a script to unrar all files in a certain directory (/rared for argument's sake) and place the expanded files in /unrared. I would like to change this script so that it deletes the original rar archives from /rared only if they successfully extracted.

This does not mean that unrar has reported that they have been fully extracted, because I have had data corruption during decompression before.

Ideally (pie-in-the-sky, just to give you an idea of what I'm shooting for,) the unrar program would include this functionality, comparing an expected md5sum value with the actual md5sum value and only deleting the archive if they match. I don't mind scripting this entire process if I have to, but there must be a better way than unraring twice and comparing md5sums.

Has anyone got Lightroom 3 working under wine? As with most posts out there, I have successfully completed the install, but where the photos should be (in grid view, loupe view or edit view) there are only gray squares.

I have run winetricks vcrun6 colorprofile corefonts vista gdiplus already, no change.

I'm looking in to gaming on Ubuntu (using PlayOnLinux - i.e. wine). What is the most modern game you have run at an acceptable framerate and what hardware were you running? Did you have to tweak your wine or gfx card settings? If so, how?