Editing Compatible Time-Sharing System (section)

==Features==
* The original [[ELIZA]] ran on CTSS.<ref name="50th" />
* CTSS was the first computer system to implement [[password]] login.<ref>{{cite web |last1=McMillan |first1=Robert |title=The World's First Computer Password? It Was Useless Too |url=https://www.wired.com/2012/01/computer-password/ |publisher=[[Wired magazine]] |access-date=22 March 2019 |date=27 January 2012 |archive-date=25 June 2024 |archive-url=https://web.archive.org/web/20240625150807/https://www.wired.com/2012/01/computer-password/ |url-status=live }}</ref><ref>{{cite web |last1=Hunt |first1=Troy |title=Passwords Evolved: Authentication Guidance for the Modern Era |url=https://www.troyhunt.com/passwords-evolved-authentication-guidance-for-the-modern-era/ |access-date=22 March 2019 |date=26 July 2017}}</ref>
* CTSS had one of the first computerized text editing and formatting utilities, called [[TYPSET and RUNOFF]] (the successors of MEMO, MODIFY and DITTO).
* CTSS had one of the first inter-user messaging implementations, pioneering [[electronic mail]].<ref name="thvv">[[Tom Van Vleck]]'s memoir of [http://www.multicians.org/thvv/mail-history.html The History of Electronic Mail] {{Webarchive|url=https://web.archive.org/web/20171202025034/http://www.multicians.org/thvv/mail-history.html |date=2017-12-02 }}</ref>
* CTSS had one of the first [[instant messaging]] systems similar to [[write (Unix)|write]].<ref>{{cite book |last=Fetter |first=Mirko |date=2019 |title=New Concepts for Presence and Availability in Ubiquitous and Mobile Computing |url=https://books.google.com/books?id=knqIDwAAQBAJ&dq=%22ctss%22+%22write+command%22&pg=PA38 |publisher=[[University of Bamberg]] Press |page=38 |isbn=978-3-86309-623-6 |quote=The basic concept of sending instantaneously messages to logged in users came with ... CTSS ... |access-date=2023-03-19 |archive-date=2024-06-25 |archive-url=https://web.archive.org/web/20240625150926/https://books.google.com/books?id=knqIDwAAQBAJ&dq=%22ctss%22+%22write+command%22&pg=PA38#v=onepage&q=%22ctss%22%20%22write%20command%22&f=false |url-status=live }}</ref>
* MIT Computation Center staff member [[Louis Pouzin]] created for CTSS a command called [[RUNCOM]], which executed a list of commands contained in a file.<ref name="50th" /> RUNCOM also provided for parameter substitution.<ref name="ctsspg69" /> He later created a design for the [[Multics]] [[Shell (computing)|shell]] that was implemented by [[Glenda Schroeder]] which in turn inspired Unix [[shell script]]s.<ref>{{cite web |url=https://www.multicians.org/shell.html |title=The Origin of the Shell |last=Pouzin |first=Louis |author-link=Louis Pouzin |date= |website=Multicians |access-date=February 17, 2022 |archive-date=December 21, 2017 |archive-url=https://web.archive.org/web/20171221142542/http://www.multicians.org/shell.html |url-status=live }}</ref><ref>{{cite book |last=Raymond |first=Eric S. |author-link=Eric S. Raymond |date=2003 |title=The Art of UNIX Programming |location=Boston |publisher=Pearson Education |page=234 |isbn=978-0-13-246588-5}}</ref>
* CTSS had an implementation of the text editor [[QED (text editor)|QED]], the predecessor of [[Ed (text editor)|ed]], [[Vi (text editor)|vi]], and [[Vim (text editor)|vim]], with regular expressions added by [[Ken Thompson]].