Ex (text editor)

ex
Original author(s)Bill Joy
Initial releaseMarch 9, 1978 (1978-03-09) (as part of 1BSD)
Written inC
Operating systemUnix
PlatformCross-platform
TypeText editor

ex, (short for extended), is a line editor for Unix systems originally written by Bill Joy in 1976, beginning with an earlier program written by Charles Haley. Multiple implementations of the program exist; they are standardized by POSIX.