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The data structure can then be read and written to using the ! and := operators, respectively. ^e If no initial value is given, an invalid value is automatically assigned (which will trigger a run-time exception if it used before a valid value has been assigned).
GNU Readline is a software library that provides in-line editing and history capabilities for interactive programs with a command-line interface, such as Bash. It is currently maintained by Chet Ramey as part of the GNU Project .
CLIST (MVS Command List) CMS EXEC; csh and tcsh (by Bill Joy UC Berkeley) DIGITAL Command Language CLI for VMS (DEC, Compaq, HP) DOS batch language (for IBM PC DOS, pre-Windows) EXEC 2; Expect (a Unix automation and test tool) fish (a Unix shell) Hamilton C shell (a C shell for Windows) ksh (a standard Unix shell, written by David Korn) Nushell ...
In 1964, the expression READ-EVAL-PRINT cycle is used by L. Peter Deutsch and Edmund Berkeley for an implementation of Lisp on the PDP-1. [3] Just one month later, Project Mac published a report by Joseph Weizenbaum (the creator of ELIZA, the world's first chatbot) describing a REPL-based language, called OPL-1, implemented in his Fortran-SLIP language on the Compatible Time Sharing System (CTSS).
COMMAND.COM, the original Microsoft command line processor introduced on MS-DOS as well as Windows 9x, in 32-bit versions of NT-based Windows via NTVDM; cmd.exe, successor of COMMAND.COM introduced on OS/2 and Windows NT systems, although COMMAND.COM is still available in virtual DOS machines on IA-32 versions of those operating systems also.
Standard input is a stream from which a program reads its input data. The program requests data transfers by use of the read operation. Not all programs require stream input. For example, the dir and ls programs (which display file names contained in a directory) may take command-line arguments, but perform their operations without any stream ...
ncurses (new curses) is a programming library for creating textual user interfaces (TUIs) that work across a wide variety of terminals; it is written in a way that attempts to optimize the commands that are sent to the terminal, so as reduce the latency experienced when updating the displayed content.
Python sets are very much like mathematical sets, and support operations like set intersection and union. Python also features a frozenset class for immutable sets, see Collection types. Dictionaries (class dict) are mutable mappings tying keys and corresponding values. Python has special syntax to create dictionaries ({key: value})