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Old 03-10-2006, 06:38 PM   #1
Registered: Mar 2006
Location: birmingham uk
Distribution: Fedora 7 + Ubuntu
Posts: 36

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Unhappy Why doesn't linux understand my commands

I bought redhat linux fedora for dummies, book and instalation DVD and carried out the instructions correctly (as far as i can tell).
everything seems ok when i first log on but when a open a terminal window, log on as root, and try to input a command as quoted in the book (eg iptables -L)i receive the message 'iptables command not konwn'. all commands seem to be replied with 'command not known'. I guess i must have messed up the installation some how. I've tried re-installing but the problem persists.
I'm new to linux and really want to get into this but i'm growing very frustrated.
please help!
Old 03-10-2006, 06:41 PM   #2
Senior Member
Registered: May 2004
Location: Hilliard, Ohio, USA
Distribution: Slackware, Kubuntu
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This is because you're running those commands as an unpriviledged user and those specific ones need to be executed as root. The reason is that those commands (eg: iptables) are typically in root's $PATH.

So, either run these as root, or modify your $PATH so those directories are in it. I advise reading RUTE.
Old 03-10-2006, 06:44 PM   #3
Registered: Aug 2002
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su will use the users environment not root's
su - will use roots environment.
Old 03-10-2006, 07:35 PM   #4
Registered: Jul 2005
Location: La Paz, Bolivia
Distribution: Debian Sarge - Sid, Slackware, Gentoo, openSuse, Fedora, Ubuntu, Mandriva
Posts: 241

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Actually Fedora is very peculiar in this. Even you are root you can't use the commands reserved for root in any directory. You have to go to /sbin and then use these comands using ./iptables for example.

If you want to correct this bevahior, follow scuzzman advice and modify your $PATH and include /sbin.


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