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T-U
TCP/IP (Transmission Control Protocol/Internet Protocol)
TCP/IP is a suite of communications protocols for internetwork communication. It is primarily used as the communication system for the Internet.
Telnet
A terminal emulation program that allows you to connect to remote computers. RHEL 3 includes the Kerberos version of the Telnet server, as configured through the /etc/xinetd.d/krb5-telnet configuration file.
tmpwatch
The tmpwatch command removes files that have not been accessed in a specified number of hours. The default daily tmpwatch script checks files in the /tmp and /var/tmp directories.
Very Secure FTP (vsFTP)
The Very Secure FTP service is the default FTP server for RHEL 3.
umask
The umask command defines default permissions for newly created files.
user ID (UID)
Every Linux user has a user ID, as defined in /etc/passwd.
usermod
The usermod command modifies different settings in /etc/passwd, such as expiration date and additional groups.
