modprobe aha1542 command not found

[David Curry]

Jonathan Berry wrote:

>On Mon, 31 Jan 2005 06:07:02 +0400, Steve Sykes <ssykes at emirates.net.ae> wrote:
>[reorder]
>  
>
>>On Mon, 2005-01-31 at 06:35, Krzysztof Kujawski wrote:
>>    
>>
>>>I am logged as `su' and I can't detect SCSI host AHA1542.
>>>After command `modprobe aha1542' I got `command not found'.
>>>
>>>When I am logged as `root' it works.
>>>
>>>Chris
>>>      
>>>
>>You need to use the path, which is '/sbin/modprobe aha1542'.
>>
>>Steve
>>    
>>
>
>You have gotten correct responses, but just to explain things fully:
>The "su" command does not change the path environment variable.  This
>variable tell the shell where to look for a particular command (ie
>program) if no path is given for the command.  For normal users, this
>usually includes directories such as /usr/bin/, /usr/local/bin/, etc
>(run "echo $PATH" to see them all).  Commands usually only allowed by
>root are stored in /sbin/ or /usr/sbin/.  modprobe for one is in
>/sbin/ as indicated by Steve.  So when you use the "su" command, the
>system does not update the path to include /sbin/, so it won't look
>there for modprobe and needs the full path to it to run.  You can also
>use "su -" which will update the path to include /sbin/.  Thus, you
>don't need to have the /sbin/ in your modprobe command, just like you
>were logged in as root.
>
>Jonathan
>
>  
>
Jonathan, thanks for the explanation of the difference between su and su -.