TSClient error message - FIX

on tsclient, I have been getting an error message on disconnecting from windows servers. Here is how I corrected them:

1) Check the protocol, it should be RDPv5
2) Check the default colour setting, it should be "16 bit"
3) keyboard layout, it should be EN-US, not default

Linux User commands

useradd - Adding a new user

Options:

• -d home directory
• -s starting program (shell)
• -p password
• -g (primary group assigned to the users)
• -G (Other groups the user belongs to)
• -m (Create the user's home directory

Example: To add a new user with

• a primary group of users
• a second group mgmt
• starting shell /bin/bash
• password of xxxx
• home directory of roger
• create home directory
• a login name of roger

useradd -gusers -Gmgmt -s/bin/shell -pxxxx -d/home/roger -m roger

top of page

---

usermod - Modifying existing user

Options:

• -d home directory
• -s starting program (shell)
• -p password
• -g (primary group assigned to the users)
• -G (Other groups the user belongs to)

Example: To add the group 'others' to the user roger

usermod -Gothers roger

top of page

---

userdel - Deleting a user

Options:

• -r (remove home directory)

Example: To remove the user 'roger' and his home directory

userdel -r roger

top of page

---

passwd - User's Password

Options:

• user's name (Only required if you are root and want to change another user's password)

Example: To change the password for the account you are currently logged in as...

passwd
Enter existing password
Enter new password
Enter new password again (to validate)

Example: To change the password for the user 'roger' (only you are logged in as root)...

passwd roger
Enter existing password (can be either roger's password or root's password)
Enter new password
Enter new password again (to validate)

top of page

---

Where user and group information stored

User names and primary groups are stored in /etc/passwd. This file can be directly edited using the 'vi' editor, although this is not recommended. Format of the file is...

• User name (normally all lower case)
• Password (encrypted - only contains the letter 'x')
• User ID (a unique number of each user)
• Primary Group ID
• Comment (Normally the person's full name)
• Home directory (normally /home/
• Default shell (normally /bin/bash)

Each field is separated by a colon.

Passwords for each user are stored in /etc/shadow. This file should only be changed using the passwd command.

Group information is stored in /etc/group. This file can be directly edited using the 'vi' editor. Format of the file is...

• Group name
• Group password (hardly ever used)
• Group ID
• User names (separated by commas)

Each field is separated by a colon.

Default files

When a new user is created, the default files and directories that are created are stored in /etc/skel.

This directory can be modified to fit your needs. Modifications only effect new users and does not change anything for existing users.

top of page

---

su - Switch User

To switch to another user, use the su command. This is most commonly used to switch to the root account.

Example: To switch to root account...
su
Enter root's passwd

Example: To switch to the user 'roger'...
su roger
Enter roger's or root's passwd

To return to original user, enter exit

List user accounts in Linux

To list all the user accounts on a Linux machine type the following:

less /etc/passwd

Anatomy of the Linux networking stack

A very good explanation of the networking stack

http://www.ibm.com/developerworks/linux/library/l-linux-networking-stack/?ca=dgr-lnxw01lnxNetStack

Firefox: Search Google from URL

To be able to search google from the URL in Firefox you need to modify the about:config section

Type "about:config" in the url

In the filter field type "keyword.url"

replace with:
http://www.google.com/search?q=

Dovecot on Ubuntu

When using dovecot on ubuntu, be sure to apt-get install dovecot-imapd.

This is key....

Firewall clear VPN

In Juniper FW's you can clear the VPN tunnel by typing "clear ike all" from a telnet session on the FW.

VI Tutorial

http://acs.ucsd.edu/info/vi_tutorial.shtml

Linux Cheat Sheet

http://fosswire.com/2007/08/02/unixlinux-command-cheat-sheet/