Red Hat ENTERPRISE LINUX WS 2.1 - Guida di Installazione Scaricare il pdf (Pagina 217)

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testuser:x:1001:1003:testuser:/home/testuser:/bin/bash

meaning of the fields:

1: Login name

2: password

3: User Id; must be a unique number for each user

4: Group Id; must be a unique number for each group

5: Full Name; the users full name, may contain blanks

6: home directory; usually /home/"user", but can be different

7: shell; must contain full pathname e.g. /bin/sh or /bin/bash

In the field password there are several entries possible:

• the field is empty

Security leak: the user has no password, everybody is able to login on this ac-

count

• the field contains an encrypted password

Security leak: the user has a password, everybody is able to read and proba-

bly able to decrypt this password

• the field contains: *

There is no password which translates to the encrypted password: *

Nobody is able to login on this account

• the field contains: x (default configuration)

The account has a shadow password. The encrypted password is written in

the file /etc/shadow that is only readable for root (see chapter 13.2.1).

This is the default setting on Red Hat Enterprise Linux WS 3

13.2.3 /etc/group

The file /etc/group

• contains the complete information for groups of login accounts

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Red Hat ENTERPRISE LINUX WS 2.1 - Guida di Installazione Pagina 217