SOS

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 SOS-11 (Son Of Stopgap) line editor for RSTS/E

 Author:    William T. Marshall
 Manual:    http://sites.google.com/site/texteditors/Home/files/SOSUG.txt
 Family:    DecFamily LineEditorFamily
 Platform:  DEC PDP-10, PDP-11 under RSTS/E
 License:   Commercial

Abstract: SOS-11 is an easy to use but powerful line oriented editing system, available on the RSTS/E V6B operating system. It supports all the features of the PDP-10 program by the same name, and is operated in an almost identical manner. SOS organizes the file into lines and pages, which can be referenced either by a line/page number or by textual content. Most commands operate on lines as single units, and one command (ALTER) includes a very powerful character oriented editing subsystem. SOS operates on stream ASCII (BASIC+) files and RMS record formatted files, either type.

SOS provides the following features:

Simple, but powerful, commands. Each command usually consists of a single-lettered "verb", followed by a number or range of numbers indicating the line(s) on which the commandis to perform.
An "indirect command" file. The user can put a frequently-used sequence of commands into a file. When the file is called, SOS will then perform the commands.
The full ASCII character set, including lower-case characters.
A search facility. This enables the user to search through a file with strings of text instead of line numbers."