Don’t use the Ubuntu Netbook Remix but the Desktop version.
To fix the monitor resolution:
https://wiki.ubuntu.com/HardwareSupportComponentsVideoCardsPoulsbo/
Wi-fi should work out of the box
Copy a file from a remote location to a local directory (for example to burn a backup on DVD):
scp backups@server1:backup20100105 local/path
/**
* Extracts the most recurrent one-word and two-word terms in a file
* Filters out some common stop words and you can also pass extra ones
*
* @param string $filepath
* @param int $minWordLength - the minimal word length for the terms to extract
* @param int $numberOfTerms - the number of terms to retrieve
* @return array of string - the most recurrent terms
*/
function getMostRecurrentTermsInFile ($filepath, $minWordLength, $numberOfTerms, array $extraStopWords)
{
$stopwords = array(’a', ‘about’, ‘above’, ‘above’, ‘across’, ‘after’, ‘afterwards’, ‘again’, ‘against’, ‘all’,
‘almost’, ‘alone’, ‘along’, ‘already’, ‘also’,'although’,'always’,'am’,'among’, ‘amongst’, ‘amoungst’, ‘amount’,
‘an’, ‘and’, ‘another’, ‘any’,'anyhow’,'anyone’,'anything’,'anyway’, ‘anywhere’, ‘are’, ‘around’, ‘as’, ‘at’,
‘back’,'be’,'became’, ‘because’,'become’,'becomes’, ‘becoming’, ‘been’, ‘before’, ‘beforehand’, ‘behind’, ‘being’,
‘below’, ‘beside’, ‘besides’, ‘between’, ‘beyond’, ‘bill’, ‘both’, ‘bottom’,'but’, ‘by’, ‘call’, ‘can’, ‘cannot’,
‘cant’, ‘co’, ‘con’, ‘could’, ‘couldnt’, ‘cry’, ‘de’, ‘describe’, ‘detail’, ‘do’, ‘done’, ‘down’, ‘due’, ‘during’,
‘each’, ‘eg’, ‘eight’, ‘either’, ‘eleven’,'else’, ‘elsewhere’, ‘empty’, ‘enough’, ‘etc’, ‘even’, ‘ever’, ‘every’,
‘everyone’, ‘everything’, ‘everywhere’, ‘except’, ‘few’, ‘fifteen’, ‘fify’, ‘fill’, ‘find’, ‘fire’, ‘first’, ‘five’,
‘for’, ‘former’, ‘formerly’, ‘forty’, ‘found’, ‘four’, ‘from’, ‘front’, ‘full’, ‘further’, ‘get’, ‘give’, ‘go’, ‘had’,
‘has’, ‘hasnt’, ‘have’, ‘he’, ‘hence’, ‘her’, ‘here’, ‘hereafter’, ‘hereby’, ‘herein’, ‘hereupon’, ‘hers’, ‘herself’,
‘him’, ‘himself’, ‘his’, ‘how’, ‘however’, ‘hundred’, ‘ie’, ‘if’, ‘in’, ‘inc’, ‘indeed’, ‘interest’, ‘into’, ‘is’, ‘it’,
‘its’, ‘itself’, ‘keep’, ‘last’, ‘latter’, ‘latterly’, ‘least’, ‘less’, ‘ltd’, ‘made’, ‘many’, ‘may’, ‘me’, ‘meanwhile’,
‘might’, ‘mill’, ‘mine’, ‘more’, ‘moreover’, ‘most’, ‘mostly’, ‘move’, ‘much’, ‘must’, ‘my’, ‘myself’, ‘name’, ‘namely’,
‘neither’, ‘never’, ‘nevertheless’, ‘next’, ‘nine’, ‘no’, ‘nobody’, ‘none’, ‘noone’, ‘nor’, ‘not’, ‘nothing’, ‘now’,
‘nowhere’, ‘of’, ‘off’, ‘often’, ‘on’, ‘once’, ‘one’, ‘only’, ‘onto’, ‘or’, ‘other’, ‘others’, ‘otherwise’, ‘our’, ‘ours’,
‘ourselves’, ‘out’, ‘over’, ‘own’,'part’, ‘per’, ‘perhaps’, ‘please’, ‘put’, ‘rather’, ‘re’, ’same’, ’see’, ’seem’, ’seemed’,
’seeming’, ’seems’, ’serious’, ’several’, ’she’, ’should’, ’show’, ’side’, ’since’, ’sincere’, ’six’, ’sixty’, ’so’, ’some’,
’somehow’, ’someone’, ’something’, ’sometime’, ’sometimes’, ’somewhere’, ’still’, ’such’, ’system’, ‘take’, ‘ten’, ‘than’,
‘that’, ‘the’, ‘their’, ‘them’, ‘themselves’, ‘then’, ‘thence’, ‘there’, ‘thereafter’, ‘thereby’, ‘therefore’, ‘therein’,
‘thereupon’, ‘these’, ‘they’, ‘thickv’, ‘thin’, ‘third’, ‘this’, ‘those’, ‘though’, ‘three’, ‘through’, ‘throughout’, ‘thru’,
‘thus’, ‘to’, ‘together’, ‘too’, ‘top’, ‘toward’, ‘towards’, ‘twelve’, ‘twenty’, ‘two’, ‘un’, ‘under’, ‘until’, ‘up’, ‘upon’,
‘us’, ‘very’, ‘via’, ‘was’, ‘we’, ‘well’, ‘were’, ‘what’, ‘whatever’, ‘when’, ‘whence’, ‘whenever’, ‘where’, ‘whereafter’,
‘whereas’, ‘whereby’, ‘wherein’, ‘whereupon’, ‘wherever’, ‘whether’, ‘which’, ‘while’, ‘whither’, ‘who’, ‘whoever’, ‘whole’,
‘whom’, ‘whose’, ‘why’, ‘will’, ‘with’, ‘within’, ‘without’, ‘would’, ‘yet’, ‘you’, ‘your’, ‘yours’, ‘yourself’, ‘yourselves’,
‘the’);
$stopwords = array_merge($stopwords, $extraStopWords);
// placing each word on a separate line
$command = ’sed -e “s/[^a-zA-Z]/\n/g” ‘ . $filepath;
$command .= ‘|’;
// striping out the empty lines
$command .= ‘grep -v “^$”‘;
$command .= ‘|’;
// adding lines combining all adjacent two words
// N.B.: I am commenting the single quotes inside the command
$command .= ‘awk \’(PREV!=”") {printf “%s\n%s %s\n”, PREV, PREV, $1} {PREV=$1}\”;
$command .= ‘|’;
// stripping out common stopwords (the actual command is something like this: grep -Ev ‘(\bis\b|\bsuch\b)’)
$command .= ‘grep -Evi “(\b’;
$command .= implode(’\b|\b’, $stopwords);
$command .= ‘\b)”‘;
$command .= ‘|’;
// removing all the words shorter than $minWordLength characters
$limit = $minWordLength -1;
$command .= “grep -Ev ‘^[a-zA-Z]{1,$limit}$’”;
$command .= ‘|’;
// N.B.: we are commenting the single quotes inside the command
$command .= ’sort | uniq -c | sort -nr’;
$command .= ‘|’;
// stripping out the numbers we use for sorting
$command .= “sed -e ’s/^[^0-9]*[0-9]* //g’”;
$command .= ‘|’;
$command .= ” head -n $numberOfTerms”;
$commandOutput = shell_exec($command);
$commandOutputLines = explode(”\n”, $commandOutput);
// sanitising the return
$ret = array();
foreach ($commandOutputLines as $commandOutputLine)
{
$commandOutputLine = trim($commandOutputLine);
if ( strlen($commandOutputLine) > 0 )
{
$ret[] = $commandOutputLine;
}
}
return $ret;
}
You have to install kdepim:
_ yum install kdepim (on RedHat and CentOS)
_ apt-get install kdepim (on Debiam/Ubuntu)
By doing that you can use KAlarm (that actually is a KDE program)
_ Find the torrent with http://www.mininova.org/ or search on Google “Gladiator download torrent”
_ Use Transmission to download the torrent
_ opersubtitles.org
* Go to youtube.com and try to play a video. You should not be able to play it
* Instead of the video, there should be a link like ‘Install Flash’
* You should be redirected to the Adobe website where you can download an RPM package
* After downloading it, install it with the rpm -i command (as root)
* Then, launch:
sudo yum install flash-plugin
I want to append the string “BYE” to the file test.txt
echo “BYE” >> test.txt
Now, I want to prepend the string “HI” to the file test.txt
echo “HI”|cat - test.txt > /tmp/out && mv /tmp/out test.txt
Rolling back yum packages:
http://dailypackage.fedorabook.com/index.php?/archives/17-Wednesday-Why-Repackaging-and-Rollbacks.html
http://www.vincentverhagen.nl/2007/12/10/how-to-roll-back-packages-on-centos-5-rhel-5/
When you’ve installed/updates packages with yum or rpm, you can quite easily roll back the updates/installations using rpm.
For this, yum and rpm need to save roll back information, which they do not do by default.
To enable the roll back feature, do the following:
Add tsflags=repackage to /etc/yum.conf.
Add %_repackage_all_erasures 1 to /etc/rpm/macros. If /etc/rpm/macros does not exist, just create it.
You can now install, erase and update packages with yum and/or rpm, and they will save roll back information.
When you want to roll back, use rpm to do so.
You do this by specifying the –rollback switch and a date/time, like the examples below:
rpm -Uhv –rollback ‘19:00′
rpm -Uhv –rollback ‘8 hours ago’
rpm -Uhv –rollback ‘december 31′
rpm -Uhv –rollback ‘yesterday’
There are 4 functions:
_ exec
_ system
_ passthru
_ shell_exec
They basically differ for the return. The best seems to be the last one, if you need the whole command output in your PHP script.
Use Public/Private Keys for Authentication
Using encrypted keys for authentication offers two main benefits. Firstly, it is convenient as you no longer need to enter a password (unless you encrypt your keys with password protection) if you use public/private keys. Secondly, once public/private key pair authentication has been set up on the server, you can disable password authentication completely meaning that without an authorized key you can’t gain access - so no more password cracking attempts.
It’s a relatively simple process to create a public/private key pair and install them for use on your ssh server.
First, create a public/private key pair on the client that you will use to connect to the server (you will need to do this from each client machine from which you connect):
$ ssh-keygen -t rsa
This will create two files in your (hidden) ~/.ssh directory called id_rsa and id_rsa.pub. id_rsa is your private key and id_rsa.pub is your public key.
If you don’t want to still be asked for a password each time you connect, just press enter when asked for a password when creating the key pair. It is up to you to decide whether or not you should password encrypt your key when you create it. If you don’t password encrypt your key, then anyone gaining access to your local machine will automatically have ssh access to the remote server. Also, root on the local machine has access to your keys although one assumes that if you can’t trust root (or root is compromised) then you’re in real trouble. Encrypting the key adds additional security at the expense of eliminating the need for entering a password for the ssh server only to be replaced with entering a password for the use of the key.
Now set permissions on your private key:
$ chmod 700 ~/.ssh
$ chmod 600 ~/.ssh/id_rsa
Copy the public key (id_rsa.pub) to the server and install it to the authorized_keys list:
$ cat id_rsa.pub >> ~/.ssh/authorized_keys
Note: once you’ve imported the public key, you can delete it from the server.
and finally set file permissions on the server:
$ chmod 700 ~/.ssh
$ chmod 600 ~/.ssh/authorized_keys
The above permissions are required if StrictModes is set to yes in /etc/ssh/sshd_config (the default).
Now when you login to the server you won’t be prompted for a password (unless you entered a password when you created your key pair). By default, ssh will first try to authenticate using keys. If no keys are found or authentication fails, then ssh will fall back to conventional password authentication.
Once you’ve checked you can successfully login to the server using your public/private key pair, you can disable password authentication completely by adding the following setting to your /etc/ssh/sshd_config file:
# Disable password authentication forcing use of keys
PasswordAuthentication no
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