- digest
a collection of new messages mailed to the members of an archived list as one message. A list is called digested when it is archived and, periodically, a digest is sent out.
- Group ID
(GID)an identification number assigned to files, directories, and processes to restrict access--similar to UID except multiple people can be a member of a group. On Unix-type systems, groups can be set up (defined in the /etc/group file). When a user name is a member of a group, she can access files created with that GID (assuming permissions allow it).
- Mail Transfer Agent
(MTA)a program, such as Sendmail, responsible for passing mail from one location to another.
- Set Group ID
(SGID)a file attribute which allows a program to run with specific group privileges no matter who executes it.
- smrsh
(SendMail Restricted SHell) the shell that Sendmail uses to execute programs. smrsh puts restrictions on the programs that can be run to make it safer than using a regular shell such as the Bourne Shell.
- Set User ID
(SUID)a file attribute which allows a program to run as a specific user no matter who executes it.
- User ID
(UID)an identification number assigned to files directories, and processes--similar to GID except every user has a unique UID. Every process must run under a UID (the one-to-one relationship between the UID and user name is defined in /etc/passwd). The process' UID determines what the program can access. In general a regular user can change the permissions on files that she owns unless the UID is 0 (the root user). In that case, root can modify any files on the system.
- wrapper
a program used to start another program; usually a wrapper is SUID or SGID so it can bestow privileges onto another program that the other program would not normally have.
