Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - COMMAND-LINE Uživatelský manuál stáhnout pdf (Strana 50)

adduser user_name

Create a new account (you must be root). E.g., adduser barbara Don't forget to set up the

password for the new user in the next step. The user home directory is /home/user_name.

useradd user_name

The same as the command " adduser user_name ".

userdel user_name

Remove an account (you must be a root). The user's home directory and the undelivered mail

must be dealt with separately (manually because you have to decide what to do with the files).

groupadd group_name

Create a new group on your system. Non-essential but can be handy even on a home machine

with a small number of users.

passwd

Change the password on your current account. If you are root, you can change the password for

any user using: passwd user_name

chmod perm filename

(=change mode) Change the file access permission for the files you own (unless you are root in

which case you can change any file). You can make a file accessible in three modes: read (r),

write (w), execute (x) to three classes of users: owner (u), members of the same group as the

owner (g), others on the system (o). Check the current access permissions using:

ls -l filename

If the file is accessible to all users in all modes it will show:

rwxrwxrwx

The first triplet shows the file permission for the owner of the file, the second for his/her group,

the third for others. A "no" permission is shown as "-".

E.g., this command will add the permission to read the file "junk" to all (=user+group+others):

chmod a+r junk

This command will remove the permission to execute the file junk from others:

chmod o-x junk

Also try here for more info.

You can set the default file permissions for the news files that you create using the command

umask (see man umask).

chown new_ownername filename

chgrp new_groupname filename

Change the file owner and group. You should use these two commands after you copy a file for

use by somebody else.

(=substitute user id) Assume the superuser (=root) identity (you will be prompted for the

password). Type "exit" to return you to your previous login. Don't habitually work on your

machine as root. The root account is for administration and the su command is to ease your

access to the administration account when you require it. You can also use "su" to assume any

other user identity, e.g.

su barbara will make me "barbara" (password required unless I am a

superuser).

kernelcfg

(as root in X terminal). GUI to to add/remove kernel modules. You can do the same from the

command line using the command "

insmod", but "insmode" is less "newbie-friendly".

lsmod

List currently loaded kernel modules. A module is like a device driver--it provides operating

system kernel support for a particular piece of hardware or feature.

modprobe -l |more

List all the modules available for your kernel. The available modules are determined by how

your Linux kernel was compliled. Every possible module/feature can be compiled on linux as

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