for ($i=1; $i<=365; $i++) echo date( "Y-m-d", mktime( 0, 0, 0, 1, $i)). "\n";

for ($i=4; $i<=365; $i+=7) [...]

for ($i=1; $i<=365; $i++) echo date( "Y-m-d", mktime( 0, 0, 0, 1, $i, 1+date("Y"))). "\n";

• in a new tab, open "about:config" and search for "http://www.google" (search box is located at the top of the tab area). You 'll find "keyword.URL" setting and you can change its value by double-clicking on it. Just add "s" after "http".
  
  
  
• open bookmarks by pressing Ctrl+Shift+B and search for "google.com/search? q=" (search box is located at the upper right corner of the window). At first, you can eliminate all duplicates (as I did), then change all "http" occurrences to "https"
  
  
  

locate -i jquery | grep "jquery.js"  | wc -l

locate -i jquery | egrep "jquery.*\.js"  | wc -l

• Easy setup: Just copy-paste the code from the Google Web Elements page and start using it. Also, there is no need for local storage or a dedicated database.
• Instant notifications: The members can see the replies of the other members, as they are writing them or even replay the discussion step by step. There are also email notifications for new replies, so (a) there is no need to continuously check the web page and (b) you can react immediately if you detect any abuse.
• Indented replies: The members can choose to reply to a discussion or start their own.
• Identified members: There are no anonymous replies (possible spam), albeit the public nature of the wave.

aptitude install mysql-client-5.1

rm /var/lib/vnstat/eth* /var/lib/vnstat/.eth*
vnstat -u -i eth0
vnstat -u -i eth1

head --bytes=100 /dev/zero | ./test_data

head --bytes=100k /dev/zero | ./test_data

head --bytes=100k /dev/random | ./test_data

yes "testing with sample data" | head -40 | ./test_data

Adobe AIR Application Installer

#!/bin/bash
datetime=`date +%Y%m%d_%H%M`
bdir=".backup"

mkdir $bdir 2> /dev/null

for a in $*; do
cp -av $a $bdir/$datetime.$a
done
gzip -9 $bdir/$datetime.*

backup2.backup *.php *.html

style="text-align: right;"

/* inform twitter about something */
function twit( $msg = "")
{
 $username = "twitter-username";
 $password = "twitter-password";
 $ch = curl_init();
 curl_setopt( $ch, CURLOPT_URL, "http://twitter.com/statuses/update.xml");
 curl_setopt( $ch, CURLOPT_RETURNTRANSFER, TRUE); // change to FALSE for not reporting XML output
 curl_setopt( $ch, CURLOPT_POST, 1);
 curl_setopt( $ch, CURLOPT_POSTFIELDS, "status=" . urlencode( $msg));
 curl_setopt( $ch, CURLOPT_USERPWD, "$username:$password");
 ob_start();
 $response = curl_exec( $ch);
 ob_end_clean();
 curl_close( $ch);
 return $response;
}

In order to use this function, you need to have installed the cURL extension of PHP. You can check if it's installed quickly with the following command:

$ php -i | grep -i curl

If cURL is installed, you can expect an output like this:

additional .ini files parsed => /etc/php5/cli/conf.d/curl.ini,
curl
cURL support => enabled
cURL Information => libcurl/7.16.4 OpenSSL/0.9.8e zlib/1.2.3.3 libidn/1.0

If not, the package you need to install is php5-curl.

What I didn't noticed, when I was fiddling with the cursor keys, was that the first two letters of the username of the first account of the file changed to capitals.

"No big deal", you might say, except that the first account in /etc/passwd file was 'root'! And it became 'ROot', without noticing it!

Imagine my frustration when I tried to login back to root's account, without knowing what actually had happen! :-(

I don't remember exactly what error messages I saw, but I ended that by rebooting the machine in single user mode, mounting the root partition in a directory and recovering back the root account.

What this little story taught me, was to double-check always what I'm doing as root, especially if the keys I'm pressing don't have the expected result.

Sometimes, after I've played some video file written on a cd-rom, I can't eject it because the file is locked/used by another application/daemon (like dbus-launch or dbus-daemon).

The quicker way I've found to unlock/free the file (and eject the disc) is to use "fuser -k" with the full path specification of the file as an argument, like this:

fuser -k /cdrom/file.avi

If, on the other hand, you just want to see which processes are using a certain file, try these commands from any terminal:

fuser -v /var/spool/mail/$LOGNAME
lsof /var/spool/mail/$LOGNAME

I have 512 MB RAM in my system and a separate swap partition of the same size in my hard disk. Although the system worked most of the time (even when I used gcc compiler), it was constantly swapping in and out applications and yesterday evening my swap space reached 0 bytes of free space.

I thought that an increase of the swap partition size might solve the problem, but I didn't want to fiddle with my disk and I called this solution "plan B".

As "plan A" I decided to make more swap space by creating a swapfile. The commands I used are the following:

# dd if=/dev/zero of=/home/swapfile bs=1024 count=1048576
# mkswap /home/swapfile
 Setting up swapspace version 1, size = 1073737 kB
no label, UUID=267d82f3-0f53-42d6-bf72-6fc4bf36b8f4
# swapon /home/swapfile
# vim /etc/fstab
where I added the following line:
/home/swapfile none    swap    sw 0 0

After executing these commands, my swap space increased instantly to 1 GB, without a need to reboot and without any cost (except for 1 GB of disk space of course).

So far the system is healthy again, with a lot of usable memory, and all my favorite applications are running together as before.

$ sudo bash
# cd /etc/apache2/mods-enabled/
# ln -s /etc/apache2/mods-available/deflate.load .
# vim /etc/apache2/apache2.conf  [add the following line]
    AddOutputFilterByType DEFLATE text/html text/plain text/xml
# /etc/init.d/apache2 restart
# exit
$ 

1        file1
2        file2

2        file1
1        file2

$ EDITOR=kate vidir

1. open a new tab and write "about:config" at the address box,
2. find the "browser.urlbar.autoFill" variable in the list it will present to you when you press Enter,
   
3. double click on it to change its value to true

echo running /etc/bash.bashrc

if [ -f /etc/bash.bashrc ]; then
       . /etc/bash.bashrc
fi

bash: /usr/bin/utility: No such file or directory

hash -r

1. You have to use procmail to distribute your incoming e-mail messages into appropriate mailboxes.
2. You must enable procmail's logging feature by including a line like
   

   LOGFILE=$HOME/mail-from

   into your '~/.procmailrc' file (man procmailrc for more details)
3. Download the statmail PERL script and install it in your '~/bin' directory
4. Set up a cron job like the following (everything goes in one line and remember to edit the pathnames):
   

   00 00 * * * /home/username/bin/statmail

mysql> UPDATE people SET birth ="0000-09-30" WHERE id=1234;
Query OK, 0 rows affected, 1 warning (0.01 sec)
Rows matched: 1 Changed: 0 Warnings: 1

Warning (Code 1265): Data truncated for column 'birth' at row 1

mysql> set sql_mode="traditional";
Query OK, 0 rows affected (0.06 sec)

ERROR 1292 (22007): Incorrect date value: '0000-09-30' for column 'birth' at row 1

ls -id /

egrep -o '"http://[^"]*"' newsfeeds.opml | xargs r2e add

• newsfeeds.opml is the file where I have my RSS feeds (exported by the other program I used)
• egrep is GNU grep with extended regular expressions support
• -o '"http://[^"]*"' parses each input line and outputs just the URL of each feed
• xargs runs "r2e add" with every URL previously extracted, adding them to the database file of RSS2email

#!/usr/bin/env python
import pexpect
import sys

child = pexpect.spawn('telnet router')
child.expect('login: ')
child.sendline('PutYourUsernameHere')
child.expect('password:')
child.sendline('PutYourPasswordHere')
child.expect('$')
child.sendline('get ip address')
child.expect('\n\r([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+) *[^ ]+ *ppp-0')
ip = child.match.group(1)
print "Current IP Address:", ip

# The rest is not strictly necessary. This just demonstrates a few functions.
# This makes sure the child is dead; although it would be killed when Python exits.
if child.isalive():
    child.sendline('exit') # Try to ask ftp child to exit.
    child.close()
# Print the final state of the child. Normally isalive() should be FALSE.
if child.isalive():
    print 'Child did not exit gracefully.'

• Why every URL must start with "www." ?
• Where is the Backspace key if I want to erase something I entered by mistake (or the "www." prefix) ?

wp() {
    what="$*"
    wikipedia2text "$what" | mailx -s "wikipedia article: $what" myemail
}

wp title-terms

1. open ~/.muttrc file and append the following two lines after its last line:
   

   macro index Z |'~/bin/splitdigest.pl'\nd
   macro pager Z |'~/bin/splitdigest.pl'\nd

   (the above lines remap the key Z to (1) filter the body of the message through splitdigest script, which is located in my ~/bin directory and (2) delete the message)
   
   
2. create a new file with your favorite editor and insert the following lines to it (just remember to replace username with your login name):
   

   #!/usr/bin/perl -w
   use strict;
   use diagnostics;
   my ($outfile, $line, $i, $k);
   my (@header, @body);
   $outfile = "/var/spool/mail/username";
   open PF, ">> $outfile" or die "Couldn't open $outfile for writing: $!\n";
   push @header, "From username\@localhost  ",scalar(localtime()),"\n";
   $i = 0; $k = 0;
   foreach $line () {
         if (($i==0) && ($line !~ /^$/)) { # read header
                 if ($line =~ /^Content-Type: multipart\/alternative; /) {
                         $line = "Content-Type: text/plain; charset=utf-8\n";
                 }
                 push @header, $line if
                  ($line =~ /^(From|Date|Subject|To|Message-ID|Content-Type|Content-Transfer-Encoding): /i);
         }
         # read message body
         if ($i>0) { push @body, $line if ($line !~ /^$/); }
         # flush @body and restart with a new message
         if ($line =~ /^$/) {
                 $i=1;
                 if ($#body > 0) {
                         $k++;
                         print PF @header, $line;        # first print header
                         print PF @body, $line;          # then body
                         @body = ();                     # finally flush body
                 }
         }
   }
   # in case the message ends with a non-null line, write the rest
   if ($#body > 0) { print PF @header,"\n",@body,"\n"; }
   close PF;
   print "$k messages found and written to file [$outfile]\n";
   __END__
   
   

3. Save the file as "splitdigest.pl" in your ~/bin directory (or wherever you like) and make it executable with chmod:
   

   chmod +x ~/bin/splitdigest.pl

• The code above splits the digests where there is a blank line in it, i.e. the separator is the blank line. With a little tweaking you can use a different separator.
• I know that one can edit the whole message in Mutt by 'e'diting it. I'm using this method for its speed and convenience.

/dev/sda5 none swap sw 0 0

UUID=fac6f2c3-34a6-48c6-83f2-eb59c90cb944 none swap sw 0 0

UUID=1e93c994-8da0-4666-838f-4dd1452f9a15 none swap sw 0 0