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S
Samba
The Linux and Unix implementation of the Server Message Block protocol and the Common Internet File System. Allows computers that run Linux and Unix to communicate with computers that are running Microsoft Windows operating systems.
secure Virtual Hosts
You can configure multiple secure Virtual Hosts on a single Apache server using the secure configuration file, /etc/httpd/conf.d/ssl.conf.
sendmail
A standard e-mail server application. Most Internet e-mail uses sendmail.
server
A computer that controls centralized resources such as files and printers. Servers can share these resources with client computers on a network.
SGID
The SGID bit sets common group ID permissions on a file or directory.
Shadow Password Suite
The Shadow Password Suite creates an additional layer of protection for Linux users and groups in the /etc/shadow and /etc/gshadow files.
showmount
The showmount command lists the shared directories from an NFS server.
single-user mode
When you start RHEL 3 in single-user mode, you're automatically logged in as the root user, without networking or most services. If your Linux system has boot problems, single-user mode may allow enough access to fix the problem.
smbmount and smbumount
The smbmount and smbumount commands, when properly configured, allow regular users to mount directories shared over a Microsoft Windows network through Samba.
SMTP (Simple Mail Transfer Protocol)
A TCP/IP protocol for sending mail. sendmail uses SMTP.
SOA (Start of Authority)
In a DNS database, the SOA record is the preamble to all zone files. It describes the zone, the DNS server computer (such as ns.your-domain.com), the responsible administrator (such as hostmaster@your-domain.com), the serial number associated with this file, and other information related to caching and secondary DNS servers.
soft limit
Associated with user quotas. Specifies the maximum amount of space a user can have on a partition. Soft limits can be configured with grace periods.
spec file
Spec files are associated with SRPMs. You can modify an SRPM spec file to change the way an RPM package is built.
Squid
Squid is a high-performance HTTP and FTP caching proxy server.
SRPM (source RPM)
SRPMs include the source code required to build a binary RPM package. SRPMs are installed with the rpm -i command, which installs SRPM files within the /usr/src/redhat directory. You can then use the rpmbuild command to create a binary RPM.
SUID
The SUID bit sets common user ID permissions on a file or directory.
superuser
The superuser represents a regular user who has taken root user privileges. Closely associated with the su and sudo commands.
swap space
Linux uses swap space for less frequently used data that would otherwise be stored in RAM. It is normally configured in Linux in a swap partition.
