I saw the following script, posted online, that were used during the hadoop installation process. sudo tar xzf hadoop-0.20.2.tar.gz sudo mv hadoop-0.20.2 hadoop sudo chown -R hadoop:hadoop hadoop I do not quite understand what does the sudo chown -R hadoop:hadoop hadoop do he...

I have the following new logrotate configuration: /var/log/nexus/nexus.log { rotate 7 missingok compress delaycompress copytruncate daily } When I run logrotate -d nexus, I get the following: reading config file nexus reading config info for /var/log/nexus/nexus.log H...

I start my browser vimprobable in tabbed like so: "`tabbed -d > /tmp/tabbed.xid`; vimprobable2 -e `cat /tmp/tabbed.xid`" [1] I am then able to send all new instances of vimprobable to tabbed (and not have a new master window open), in other apps, eg., mutt, by: vimprobable2 -e $(cat /tmp/tabb...

I have logs in the following format: YYYYMMDD I want to compress old logs (older then current day) and maybe move them to a different directory afterwards. Can I do this in logrotate, or do I have to use a custom script in cron?

I've a VM running Centos 5.5 and I'm trying to get yum to update via a company proxy. I can browse the web within the VM using the proxy setting , but I cannot get yum to use the proxy. I'm getting the following error: [Errno 14] HTTP Error 302: The HTTP server returned a redirect error that ...

i need to do a setting a bit unusual. I have 3 machines with public Ips. I want to use one of them as a load balancer for the 2 others. My machine >> machine1 who redirect the connection to machine 2 or 3. If machine1 has 1 private ip on a network card and another network card with a public ip...

I have been recently trying to package a small Python utility to put on my PPA and I've almost got it to work, but I'm having problems in making the package install the binary (a chmod +x Python script) under /usr/bin. Instead it installs under /. I have this directory structure -> http://db.tt/0...

I run a server which is used by a group of individuals for e-mail, mailing lists, personal web homes etc. I thought about ways to provide root access for other members to allow them handling problems on the server. But I don't like to give full root privileges to everyone. What about the idea t...

Is there any way to make GNU Screen not close if I end all its subprocesses? Ideally, it would create a new window running a shell if I accidentally closed the last window.

I am compiling Linux kernel under Virtual Machine.For that I want .config file specification that include all available options for debugging. I am thinking about including whole of the "Kernel Hacking" configuration branch into the kernel.But,I am afraid if there's any side effect to it, in term...

Is there a way to grep html text from a curl request and output grab the value that is between two html tags? More specifically the input value of a form?

Sometimes, a USB drive (or equivalent) that I have plugged in to my machine gets unmounted. Now, I know I could unplug it and plug it back in to remount it, but is it possible to easily do it from within the system? For me, "easily" means "without using sudo" and without having to set up any sp...

If I could list that which iptables rule has how many matched packets, then I could create a better/faster iptables script that's faster. That rule would be at top/first that has the more packets matched.

Is it possible to find out which ssh key was used to access an account? I have an account on a server that I let several (trusted!) people have access to via ssh. I'd find it useful to be able to know who logged in and when. I have root access so I can look at the logs, but there doesn't seem ...

I'm just putting together a machine with eight 2TB disks. I will be using Raid 6 (12TB of usable capacity) on top of them, but I'm not sure whether I should make LVM on top of the RAID, or what filesystem to use. What filesystems can be resized when used inside LVM?

I am working on the most recent Ubuntu installed on Virtaulbox in a Windows 7 64-bit machines. How can I maximize the screen so it fills up the whole monitor? When I adjust the screen under monitor section, I cannot go any further than a square screen. Thank you.

I recently managed to install Chromium OS to a flash drive. However, when I booted into Chromium OS, I found that neither wifi or ethernet worked, yet both wifi and ethernet work on my Ubuntu partition. I was wondering if it was possible to copy the wifi and ethernet drivers from Ubuntu to Chromi...

There a way to turn on line numbering for nano? Is it even possible? Apologize for my ignorance i'm quite new.

I'm just wondering if you could help I have just setup the basic stuff for vsftpd got that working fine with root use thats all. I have also stupidly installed something to the root user home directory which I would like another user to access can this be done and how? So for example I have the...

Is there a way to find out what will program do when it receives kill signal HUP? Without simply running the command ofc :D For example, killall -HUP pppd will restart pppd killall -HUP firefox will just kill firefox

Chrome and chromium can mean many things on this site, but particularly The Google Chrome and Chromium web browsers; The Google Chrome OS and Chromium OS operating systems. We have two questions about Chrome OS (if I haven't missed one), tagged chrome-os. I suspect we'll have more in a few mo...