modprobe aha1542 command not found

Jonathan Berry berryja at
Mon Jan 31 04:56:32 UTC 2005

On Mon, 31 Jan 2005 06:07:02 +0400, Steve Sykes <ssykes at> wrote:
> 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.


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