So without further delay, following command will telnet to local memcached server on port 11211 and issue one of the memcached commands, stats

(sleep .5;echo stats) | telnet localhost 11211
You may have to play with the sleep timer to get it to work for your environment but in our .5 was the sweet spot. Good luck and let me know if you have another shell command. Obviously we can do this from perl, php, python, etc but the beauty of this is that you do not need any other dependencies plus its a very short command.

Since “jsled” commented about nc (thanks jsled), here is the syntax to do the same thing with nc:

echo "stats" | nc localhost 11211

Note: you must be logged in as root to do following.

vi /etc/passwd
find joe and change it to john, save/exit

vi /etc/group
find joe and change it to john, save/exit

vi /etc/shadow
find joe and change it to john. This file is read only and you have to force overwrite it. In vi it is :w! once saved, quit.

cd /home
mv joe john

And that should do the trick.

[Edited] Right after I posted this post, I was contacted and was told to look at utility called usermod. Read more about it man usermod. Got to love the quick responses.

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DISCLAIMER: Please be smart and use code found on internet carefully. Make backups often. And yeah.. last but not least.. I am not responsible for any damage caused by this posting. Use at your own risk.

When Linux server boots up, it calls a program called mingetty. This program creates that infamous login prompt as show in a screenshot:

You can see how server calls the mingetty program by looking at /etc/inittab. You will see a block like below:

# Run gettys in standard runlevels
1:2345:respawn:/sbin/mingetty tty1
2:2345:respawn:/sbin/mingetty tty2
3:2345:respawn:/sbin/mingetty tty3
4:2345:respawn:/sbin/mingetty tty4
5:2345:respawn:/sbin/mingetty tty5
6:2345:respawn:/sbin/mingetty tty6

When mingetty is called, it reads a file called /etc/issue. There are a lot of existing variables you use. For example the prompt shown above in example is:

CentOS release 5 (Final)
Kernel \r on an \m

All of the available variables are list here on this page: http://www.lamp-tips.com/man-pages/mingetty/

If you were paying attention in the beginning of the post and looked at all of the available variables you can use, you would notice there is nothing in there which talks about IP. Since there is no variables available, you would have to sort of hack it. Put following in your /etc/rc.local file:

echo "CentOS release 5 (Final)" > /etc/issue
echo "Kernel \r on an \m" >> /etc/issue
echo `ifconfig eth0 | grep inet | cut -d : -f 2 | cut -d \ -f 1` >> /etc/issue

Getting an ip part can be modified to check another adapter such as eth1, eth2, etc. Or you can get it another way if you want. That all there is too. Reboot, and you should see your changes.

[correction 4.24.08] you do not have to reboot to see your changes.  Just press enter at the login prompt in console and it will re-read the issue file.

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DISCLAIMER: Please be smart and use code found on internet carefully. Make backups often. And yeah.. last but not least.. I am not responsible for any damage caused by this posting. Use at your own risk.

NOTE: This set up is very “open” and should not be used on servers which are facing the world. This is for private network where you trust all the computers and its users.

Installing Samba (using yum on CentOS and Fedora): yum install samba
Installing Samba (using rpm):

1. Obtain Samba rpm from rhn.redhat.com
2. rpm -ivh samba*.rpm

Configuring Samba:
cd /etc/samba
mv smb.conf smb.conf.backup
vi smb.conf

Paste content below in to your vi:

[global]
workgroup = wrkgrp
netbios name = smbserver
security = SHARE
load printers = No
default service = global
path = /home
available = No
encrypt passwords = yes
[share]
writeable = yes
admin users = smbuser
path = /home/share
force user = root
valid users = smbuser
public = yes
available = yes

save and exit

adduser smbuser #add unix account
passwd smbuser #set unix account password
smbpasswd -a smbuser #lets create same user account on samba
<put same password as your unix account password>
/etc/init.d/smb restart

Now let us setup drive letter on our Windows so we can easily access these files.

Start -> run -> cmd <enter>

At the prompt type: net use z: \\ip_of_your_samba_server\share /user: smbuser password_you_assigned

That is it! At this point you have successfully set up Samba under Linux and are now successfully connected to your share from your Windows machine.

for old in *.php3; do cp $old `basename $old .php3`.php; done

Thats all there is to it. Let us say you need to rename index.php3 to index.php. The way above snippet works is that it loops through current directory and finds all the files with extension “.php3″ and processes ‘em one by one. In our index.php3 file example, it finds index.php3 file, does a cp index.php3 `basename index.php3 .php3`.php <- basename returns “index” so you add .php to it and now you are left with index.php. Of course you can do mv command if you want to just move the file to new name. I would suggest doing cp first to make sure things work the way you want ‘em to.

1. Replace all the bulbs in your house with energy savings one. Energy savings bulbs will save you upto 70% in utility bills and at the same time help out to make world greener by using less electricity.
2. Unplug appliances which are not in use. Even some of the chargers like your laptop charger, consumes some energy while plugged in to outlet even when there is nothing is plugged in the other side. That home entertainment system or just a cable box you have sitting around, consumes energy. All this could add upto significant $$’s. One of the products worth looking at: Smart Strip Power Strip
3. If you can afford to and have a house, put solar panels on your roof. Even though this is sort of an expensive way to go but in long (or short, depends on costs etc.) run it can save you money an maybe even make you some money. You can also depreciate this investment just like any other investments. Talk to your tax adviser for more details on tax credits. You can read more details about return on your investment at: motherearthnews.com
4. Windmills. Yeah..not the coolest thing around but if you are living in an area with lots of yard space and do qualify to put windmills there, its worth looking into.
5. Buy hybrids! Not only that you get some tax credit for buying hybrids, you can also pay A LOT less on gas stations. Of course there are many more alternatives then hybrids. You can also buy electric cars, cars which run on ethanol (http://www.msnbc.msn.com/id/11603199/) and cars which are powered by solar energy. Hybrid seems to be more mainstream choice even though for short commutes electric cars make more sense. One of the car I know of is Tesla Roadster which by no means is a cheap car! It could cost you are $100k to buy this puppy but before you say anything, check out the specs. You also have to wait until next year to get it so maybe that is too much a turn off and you rather have one of the many available hybrids.
6. Use less paper! Opt in for online statements. This alone will save a lot paper and in turn will protect the trees! Other places you can cut back would be at your work. Ask for your paystubs electronically instead of paper. You really don’t need a piece of paper to see how much you made. But if you really want to, just log in to the website and look. File your taxes via computer using e-file. All these are little things which does not make our life harder but helps with making sure we are not destroying our nature!
7. Use recycled material! Promote recycling. Ask for recycling at your work, your apartment, church, where ever you can!
8. Paper or plastic? ALWAYS pick paper. Plastic bags are VERY hard to recycle.
9. If you live close to stores, work or any other destinations, walk there instead of driving. You save on some pollution and at the same time its good for you to go for walk.
10. Make your home energy efficient. There are many ways to make this happen. Of course you are already doing #1 by now, right? Other ways would be to buy appliances which qualify. Install windows which insulate your house better. Put insulation in the outside walls. All these will make it so you don’t use all that electricity you are producing by following #3. Which in turn means you are pumping electricity back in the power grid and making some money from doing it!

This list is very brief but should be enough to get you started and thinking about things you can do to make this world a better place to live! Please feel free to add comments with your own suggestions, comments, etc.
Tagged as mysql so hopefully more people can benefit from this

Possible solutions:

1. You can remove the whole directory and recreate the directory
2. When 1 is not an option, you can you “find” to delete for you. I actually use this method more often then removing/creating directory.
   find . -exec rm {} \; This will delete everything in current directory on. Be careful with this command since you could potentially delete things you may not wanted to. I suggest running find . |more first to see what will be affected.  To read more about find see:  man find

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DISCLAIMER: Please be smart and use code found on internet carefully. Make backups often. And yeah.. last but not least.. I am not responsible for any damage caused by this posting. Use at your own risk.