Permissions - setting setuid

You can make a program setuid by giving s instead of x permission. If you have written a script x.sh, an example would be:

chmod +s x.sh

Start creating file with the name whoownsit_username.sh in /tmp directory:
```
nano /tmp/whoownsit_$USER.sh
```
Note: If your user name is sandeep1234, the filename would be whoownsit_sandeep1234.sh
Put the following content in the editor in the previous step:
```
whoami
```
Save it by pressing Ctrl+x and press y
Give it setuid permission:
```
chmod +sx /tmp/whoownsit_$USER.sh
```
Check if you have given correct permission by
```
ls -l /tmp/whoownsit_$USER.sh
```

It should display something like this in permissions: rwsrwsr-x

Note: setuid doesn't work in shell scripts. Please see http://www.faqs.org/faqs/unix-faq/faq/part4/section-7.html

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