gablog » linux

(Italiano) email autenticate in plain auth via telnet

gabo — Fri, 13 Nov 2009 14:28:07 +0000

Sorry, this entry is only available in Italiano.

(Italiano) Filtrare i messaggi in uscita con thunderbird

gabo — Mon, 29 Jun 2009 18:10:48 +0000

Sorry, this entry is only available in Italiano.

Upgrading etch to lenny

gabo — Wed, 11 Mar 2009 19:10:06 +0000

On febrary 14th the Debian distribution 5.0 (lenny) passed from testing to stable, so I need to upgrade. Probably I will do it also on production server in office, but now I start whith my home server, since it's my first dist-upgrade.

Backup

First of all a complete backup:

rsync -vrpoglHDIt --delete --progress \
--exclude=/proc --exclude=/sys --exclude=/tmp --exclude=/var/run \
--exclude=/var/lock --exclude=/var/tmp --exclude=/var/backups \
--exclude=/var/cache --exclude=/var/tmp \
--exclude=/mnt/multimedia --exclude=/mnt/mp3 \
/ /mnt/multimedia/backup

It's also possible to use a not_rsync file, but I prefer this way. For future synchronization the only difference is the missing I parameter of rsync. Here what states the man page:

-I, --ignore-times          don't skip files that match size and time
    --size-only             skip files that match in size
    --modify-window=NUM     compare mod-times with reduced accuracy

In this way new synchronization will be more precise. Now a cronjob can be useful.

Upgrade

I'm now ready for the upgrade. I suggest a reading of relase-notes on debian.org site. I modity /etc/apt/sources.list just to point on lenny repository:

deb http://ftp.it.debian.org/debian/ lenny main
deb-src http://ftp.it.debian.org/debian/ lenny main
deb http://security.debian.org/ lenny/updates main
deb-src http://security.debian.org/ lenny/updates main

The next command starts session logging, just in case something goes wrong:

script -t 2>~/upgrade-lenny.time -a ~/upgrade-lenny.script

Packet list update

aptitude update

app and aptitude upgrade, plus some dependencies

apt-get install apt

Now I've got the first difference from relases-note, the previous command remove/upgrade/install a lot of packet. Asking in forums and mailinglists I noted that it happened to other people, so I go forward, crossing finger I have to re-install aptitude through apt-get, since the last command removed it. After that I need an update

aptitude install aptitude

Again a lot of packet removed, upgraded and installed.

aptitude search "?false"

A minimal system upgrade:

aptitude upgrade

And now the real upgrade. I don't need to upgrade X, so it's sufficient the following:

aptitude dist-upgrade

At the end I tell lilo that it have to boot with the new 2.6.26-1 kernel

lilo -v

After a deep reading of possible problem I proceed with the reboot:

reboot

Here you are my new lenny-box

g4b0@debian:~$ more /etc/debian_version
5.0
g4b0@debian:~$ uname -a
Linux debian 2.6.26-1-686 #1 SMP Sat Jan 10 18:29:31 UTC 2009 i686 GNU/Linux
g4b0@debian:~$

All information in this post is provided "as is" without warranty of any kind, use it at your own risk. Happy linuxing!

(Italiano) Gmail backup

gabo — Mon, 09 Mar 2009 07:01:46 +0000

Utilizzare una mail gratuita non da alcuna garanzia di continuità/affidabilità/professionalità del servizio, e tantomeno garantisce un backup.

(Italiano) Statistiche di sistema

gabo — Sun, 08 Mar 2009 15:32:38 +0000

Sorry, this entry is only available in Italiano.

(Italiano) La cazzata del giorno

gabo — Thu, 05 Mar 2009 14:55:57 +0000

Sorry, this entry is only available in Italiano.

Recursive regular experession substitution

gabo — Fri, 27 Feb 2009 10:38:48 +0000

I found the following script very useful a lot of time. It can recursively substitute regexp passed as first argument whith the second one. The core of the script is the chstr_ric function:

function chstr_ric () {

  echo -e "Num par: $#\n$0\n$1\n$2\n$3\n"

# se non è specificata la dir di partenza parto da quella attuale
  if [ -z "$3" ]; then
    DIR=$PWD
  else
    DIR=$3
  fi

# Entro nella dir
  echo -e "directory root: $DIR\n"
  cd $DIR

  for FILE in * ; do
    if [ -d $FILE ] ; then
      echo -e "\n*************\nEntro dentro a: $DIR/$FILE\n*************"
# Se è una dir ci entro dentro e chiamo la ricorsione
      cd $FILE
      chstr_ric "$1" "$2" "$FILE"
      echo -e "\n*************\nEsco da a: $DIR/$FILE\n*************"
# finita la ricorsione risalgo nell albero delle directory
      cd ..
    else
      echo -e "\tProcesso il file: $FILE"
# se è un file attuo la sostituzione
      sed -e "s/$1/$2/g" $FILE > $FILE.newsed
      mv -f $FILE.newsed $FILE
    fi
  done
}

It checks the third parameter, and if it's present it's considered like the starting directory. If not, actual directory is set as the root. After that is scans all the files and:

If it finds a file it starts the substitution using sed and a temporary file
If it finds a directory, then it calls himself recursively using the third parameter

The script is downloadable here.

Find

gabo — Thu, 26 Feb 2009 08:31:49 +0000

Just a little reminder for that useful linux command!

Find recursively all files with the same extension

find /home/gabo -name "*.txt"

Find all files containg a string

find /home/gabo | xargs grep -i "frase da cercare"

Delete recursively all file matching the -name option

find /home/gabo -name '*~' -exec rm -f {} \;