Using Visual Basic Script you can also access elementary Windows services, some them being really useful to irritate your friends. If at any point of the script there is an error stating that the double-quotes used in it are invalid characters, just delete the copied ones and type them again manually.
With the use of a shell, you can make VBScripts run programs and other executables. To do so you have to specify following line in the beginning of the script:

Set objShell = wscript.CreateObject(“wScript.Shell”)

Afterwards you can run commands with

objShell.run program

where you replace program with the program you want to run.
To add an executable to the autostart list via registry, you use the following script:

objShell.Regwrite “HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\some_name.exe”,”C:\the\files\path.vbs

Replace the name with any name, it really can be any name, and the path of the file with the correct path. The script will then be executed on every start-up (be careful if you use this in combination with more dangerous scripts).
To make the script itself type as if it was the keyboard, use this script (a shell must be set for this as in the first script shown here):

objShell.sendkeys”key_goes_here”

Replace key_goes_here with the keys the script is supposed to hit. Some of them are embraced by curly brackets, as for example “{CAPSLOCK}”, “{NUMLOCK}”, “{SCROLLOCK}” and “{bs}” (backspace). Most however go without, as do all letter keys and enter (“~”). Combining all the locks with a loop usually gives a great script!
To make Windows’ integrated voice say some words defined by you, use the following script:

Set objVoice = CreateObject(“SAPI.SpVoice”)
objVoice.Speak “blabla”

Replace blabla with some serious things your computer has to say to you.

ls -tl | sed -n 2p

Example for disabling the quota for the user “testuser”:

setquota -u testuser 0 0 0 0 -a

Example for disabling quota for the group “testgroup”:

setquota -g testgroup 0 0 0 0 -a

sudo !!

which will execute the command that was run before with sudo. Thanks to Planetfox for this tipp.

Example for Debian and Ubuntu Linux for the user with the username “otheruser”:

usermod -s /bin/false otheruser

For Redhat, Fedora or CentOS use /sbin/nologin:

usermod -s /sbin/nologin otheruser

Warning: Do not set the shell for the root user to /bin/false or /sbin/nologin!

Example:

root@workstation:/home/otheruser# ls -la
total 8
drwxr-xr-x 2 otheruser otheruser 4096 Oct 23 11:52 .
drwxr-xr-x 3 root      root      4096 Oct 23 11:51 ..
-rwx—— 1 root      root         0 Oct 23 11:52 root_users_file

If I su now to “otheruser”, I’am able to delete the file as “otheruser” is the owner of the directory where “root_users_file” is stored:

root@workstation:/home/otheruser# su otheruser
sh-3.2$ rm root_users_file
rm: remove write-protected regular empty file `root_users_file’? y
sh-3.2$

Now to protect the file from beeing deleted, use the command chattr +i:

chattr +i root_users_file

and then try again to delete the file as “otheruser”, the action will be denied:

root@workstation:/home/otheruser# su otheruser
sh-3.2$ rm root_users_file
rm: remove write-protected regular empty file `root_users_file’? y
rm: cannot remove `root_users_file’: Operation not permitted
sh-3.2$

Now even root is not able to delete or edit the file anymore. With the command chattr -i the protection can be removed:

chattr -i root_users_file

Create a shell script with the name tolower:

vi /usr/local/bin/tolower

and enter the following content:

#!/bin/sh
echo $1 | tr ‘[:upper:]‘ ‘[:lower:]‘

Then make the script executable:

chmod +x /usr/local/bin/tolower

An test it by executing this command on the shell:

tolower “Thats a Test”

will convert the string to lowercase and show the result on the shell:

thats a test