PAM,
or Pluggable Authentication Modules, is an authentication layer that allows
programs to be written independent of a specific authentication scheme.
Applications request authentication via the PAM library, and the PAM library
determines whether the user is allowed to proceed. If an administrator wants to
implement a different authentication scheme, he just changes the PAM
configuration files and the existing programs work seamlessly.
Sallar
RedhatEnterpriseLinux Blog
Showing posts with label File Permissions. Show all posts
Showing posts with label File Permissions. Show all posts
File Permissions in Linux
In Red Hat Enterprise Linux, all files have file permissions that
determine whether a user is allowed to read, write, or execute them. When you
issue the command ls -l, the first column
of information contains these file permissions. Within this first column are
places for 10 letters or hyphens. The first space is either a hyphen, the
letter d, or the letter l. A hyphen means it is a file. If it is the letter d, the file is actually a directory. If it is the letter l, it is a symbolic link to a directory somewhere else on the file system.
The next nine spaces are divided into three sets of three. The first set of
three is the read, write, and execute permissions for the owner of the file.
The second set of three is the read, write, and execute permissions for anyone
who belongs to the user group for the file. The last set of permissions is for
anyone who has a login to the system.
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