/home/telatin

Sum numbers in a row with paste + awk

proch — Wed, 26 Oct 2011 14:00:29 +0000

When in the need of summing tracks for Artemis:

paste *.track | awk ‘{sum=0; for (i=1; i<=NF; i++) { sum+= $i } print sum}’ > sum.track

ciao

How to open .daa disk images from Linux/Ubuntu

proch — Fri, 05 Feb 2010 09:44:42 +0000

DAA files are images of CD or DVDs stored in a proprietary format, so there’s no “out-of-the-box” solution from your favourite Linux shell.

You have to download PowerISO, a software famous for its Windows incarnation but available also for Linux from their website. Download the package into a suitable directory, expand it and run the program contained as described in third line:

wget http://poweriso.com/poweriso-1.3.tar.gz
tar xfz poweriso-1.3.tar.gz
./poweriso convert "yourfile.daa" -o outputfile.iso -ot iso

Then to mount .iso file, Linux can do it for you:

mount -o loop yourfile.iso /your/folder

SQL, time to migrate to Postgre

proch — Wed, 03 Feb 2010 12:00:15 +0000

MySQL… lovely thing so easy to use.

Some drawbacks when it comes to performances, but even worst if you look for a really open source package, no matter if you use it for academia or for commercial activities (see this). I don’t want to get locked in!

So I think I have to migrate to PostgreSQL, let see if it’s so different.

Simple CSS photo gallery

proch — Tue, 04 Aug 2009 13:56:14 +0000

Adapting to page width, this simple unordered list is suitable for most photo galleries…



Gallery
class="gallery">

   
Image Caption

   
Image Caption

   
Image Caption

Found on the net…

I also found this nifty example: http://joshuaink2006.johnoxton.co.uk/templates/gallery/. Cool if you have simplicity in mind.

NIS, Autofs and kerberos within the CRIBI Network

proch — Tue, 30 Jun 2009 16:53:52 +0000

Settings memo for the CRIBI Bioinformatics network:

Install nis, autofs, nfs-client packages (optionally libpam-krb5 for kerberos authentication)
Nis domain is: cribi.unipd.it

/etc/network/interfaces

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

See /etc/krb5.conf as in package
Special issue: if your PC has a local partition for the homes, then if we want to access local homes in conflict with NIS… let’s change local home path to mount home drive in /usr/local/home instead of /home. See /etc/fstab for this.
In /etc/passwd add a nis mask (+,,,,,) and change local users home directory to /usr/local/home
See /etc/yp.conf
See /etc/auto.master
See /etc/nsswitch.conf

proch@darwin /etc/rc2.d $ ls
S10apmd                S50avahi-daemon           S90binfmt-support
S10sysklogd            S50cups                   S98nis
S11klogd               S50NetworkManager         S98usplash
S20apport              S50rsync                  S99autofs
S20dkms_autoinstaller  S50saned                  S99laptop-mode
S20hotkey-setup        S50system-tools-backends  S99ondemand
S20nfs-common          S70bootlogs.sh            S99rc.local

See /etc/pam.d/common* for kerberos

Summing values from shell

proch — Tue, 16 Jun 2009 09:27:46 +0000

Suppose you have two or more text files with one value per line

File1:

If you want to sum them:

paste first.txt second.txt | awk '{ print $1+$2; }'

User quotas with Ubuntu

proch — Mon, 02 Mar 2009 09:15:34 +0000

This step by step tutorial shows how to install and implement user quotas, to limit disk space available for selected users in a Linux system (tested on Ubuntu, using repositories).To add support for user disk quotas on Ubuntu:

Install quota from repository:

sudo apt-get install quota

Edit, as root, /etc/fstab adding usrquota and grpquota to desired partitions:

/dev/hda3       /home           ext3    defaults,usrquota,grpquota        0       2

Reboot the system.
Then

sudo edquota -u username -f /dev/desiredpartition

Editing the file:

Disk quotas for user username (uid 1050):
  Filesystem                   blocks       soft       hard     inodes     soft     hard
  /dev/hdaN                         0     31457280     31457280          0        0        0

Save that file… now do:

sudo edquota -t -f /dev/hda3

set grace periods to 0 seconds like this:

Grace period before enforcing soft limits for users:
Time units may be: days, hours, minutes, or seconds
  Filesystem             Block grace period     Inode grace period
  /dev/hda3                  0seconds               0seconds

Save, and finally:

quotaoff -a

Code:

quotaon /dev/hda3

Linux back up: a review of free tools

proch — Mon, 12 Jan 2009 12:17:01 +0000

I found a useful review of free backup systems in junauza.com. As untidy as usual, I definitely rely on premade solutions, even if I like hacking with small scripts running in cron directorys
This site provides a rsync script.

Memo: buy a 1Tb hard drive to make backup simpler…

A tiny CMS written in Perl

proch — Mon, 05 Jan 2009 09:26:08 +0000

Davide Bianchi, an Italian sysadmin popular for his tales, wrote his own CMS to manage his site. He called it “CMS FDT”, Italian acronym for “DIY CMS”… You can find it here, code and comments…

http://www.soft-land.org/articoli/cmsfdt

Alternative shell interfaces in Ubuntu Linux

proch — Mon, 05 Jan 2009 09:09:21 +0000

Faster than default Gnome-terminal, they can be installed via repository. They run under X and don’t require Gtk or Qt libraries…

1) xterm, is quite fast. I use it as a nice replacement with this shortcut:

xterm -fs 11 -fa "Courier 10 Pitch"

2) mrxvt is very fast, with nice tabs. I run it in default configuration, without antialiasing or background to keep good performance.