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You can try the following, it should work in MySQL:

UDPATE table SET num= num +1 WHERE id='x';

This way MySQL is doing the counting, and not your application or script.
Doesn't have to +1, it can do any counting.

I had the same problem once.

I forgot to add the "hostname" in the file:
/etc/hosts

127.0.0.1 localhost HOSTNAME

You can use sed
It is a very useful program with lots of option (Check the man page > man sed )

sed -i "s/12345678/${REPLACE}/g" $FILE
this replaces the string 12345678 with the contents of variable $REPLACE in the file $FILE.
the -i option let you edit the file

But if you want to replace a ...

If you want to set it for all the scripts,
you can set it in php.ini

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[Date]
date.timezone = Your/Timezone

You can use the date_default_timezone_set() function

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date_default_timezone_set('America/Los_Angeles');
print date("Y-m-d");
date_default_timezone_set('Europe/Brussels');
print date("Y-m-d");

You can pipe it using |

echo -n "test" | md5sum
(You need option -n because else md5sum will calculate the string with newline char.)

should give something like:
098f6bcd4621d373cade4e832627b4f6 -

if you don't like the - at the end
echo -n "test" | md5sum | gawk '{ print $1 }'

this is the database postfix uses to deliver the mails.

/etc/mail/aliases is the plain text file you can update.
If you didn't update it, check it for any strange user names.
Perhaps you upgraded postfix, could have changed the date stamp of the file?

/etc/mail/aliases.db is the hashed file used ...

grep has an -E option (--extended-regexp)
This allows to us regular expressions.

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grep -E 'right|left' name_of_file.txt

You can check for more than 2:

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grep -E 'right|left|up|down' name_of_file.txt

I don't know of a special function,
but this is a function I use.

function random_color()
{
$r=rand(128,255);
$g=rand(128,255);
$b=rand(128,255);
$color=dechex($r).dechex($g).dechex($b);
return "#".$color;
}

Well most of the time your linux flavor has some automatic upgrade tools.
gentoo : emerge
debian/ubuntu : apt-get

I recommend you use those.

But if you want to do it manually,
you can download the latest kernel from https://www.kernel.org/
wget https://www.kernel.org/pub/linux/kernel/v3.x/linux ...

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