Exec: /eg-zek'/ Vt., N. 1. [UNIX: From `execute'] Synonym For {chain}, Derives From The `exec(2)' Call.

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:exec: /eg-zek'/ vt., n. 1. [UNIX: from `execute'] Synonym for
{chain}, derives from the `exec(2)' call. 2. [from
`executive'] obs. The command interpreter for an {OS} (see
{shell}); term esp. used around mainframes, and prob.
derived from UNIVAC's archaic EXEC 2 and EXEC 8 operating systems.
3. At IBM and VM/CMS shops, the equivalent of a shell command file
(among VM/CMS users).

The mainstream `exec' as an abbreviation for (human) executive is
*not* used. To a hacker, an `exec' is a always a program,
never a person.
-- The AI Hackers Dictionary