[Courses] [Networking] Lesson 1

[Conor Daly]

On Thu, Mar 20, 2003 at 02:15:18PM +0000 or so it is rumoured hereabouts, 
Telsa Gwynne thought:
> 
> That's your home directory. Your home directory is stored in $HOME.
> If you type "printenv" it will print out lots of such things. These
> are environment variables, and set up your environment for you. Try
> 'printenv' after 'su' and 'su -' and you'll see differences. Two 
> very important differences: 
> 
>   * If you su from one account to another, trying to read the new 
>     account's email gets different results with 'su' and 'su -'.
> 
>   * root has extra directories on its path.

And a third:

    * root should _never_ have a '.' in its path.  This prevents
      accidental execution of a compromised/malicious program instead of
      the proper system one.

Conor
-- 
Conor Daly <conor.daly at oceanfree.net>

Domestic Sysadmin :-)
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