Documented in Volume 1 of the UNIX Programmers Manual.
See /usr/doc/ex/ on 4.2 BSD systems for additional online documentation on this.
HINT:
If you are a casual user or a beginner, you may prefer 'edit' because it
acts as a friendlier interface to the standard line editor ex.
If you are experienced with line editors, a better choice is 'ex'. Use
% man edit
for a more complete description of editors in 4.2bsd UNIX.
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