AT&T dc: Difference between revisions

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The original dc interpreter appeared in Version 1 (V1) AT&T UNIX. Therefore, dc precedes the C language (appeared in V3 UNIX) and the Bourne Shell (appeared in V7 UNIX). The authors programmed the interpreter in PDP-11 Assembly, and later rewrote it in C language. AT&T dc became the back end of AT&T bc in V6 UNIX. AT&T dc survives in systems that descend from System V, including Solaris.

POSIX only describes bc, not dc; so AT&T dc is the only reference. Other implementations (like GNU dc and OpenBSD dc) follow AT&T dc by implementing the same commands.

The manual page accidentally omits !< != !>, but AT&T dc does have these commands, and dc programmers do use them.

Ancient dc

The Unix Heritage Society preserves old versions of AT&T UNIX.

dc(I) manual, Version 1 AT&T UNIX
source code (dc1.s to dc5.s), Version 2 AT&T UNIX

Modern dc

The Heirloom Project provides AT&T dc along with other System V commands.

dc(1) manual and source code

Revision as of 18:37, 26 August 2011 (view source) rosettacode>Kernigh (The original dc interpreter... Link to ancient and modern manual pages and source code.)		Latest revision as of 22:53, 12 December 2011 (view source) rosettacode>Kernigh m (Remove beta template.)
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	{{implementation ~~beta~~\|dc}}		{{implementation\|dc}}
	The original ''dc'' interpreter appeared in Version 1 (V1) AT&T UNIX. Therefore, ''dc'' precedes the [[:Category:C\|C language]] (appeared in V3 UNIX) and the [[Bourne Shell]] (appeared in V7 UNIX). The authors programmed the interpreter in [[:Category:PDP-11 Assembly\|PDP-11 Assembly]], and later rewrote it in C language. AT&T dc became the back end of [[AT&T bc]] in V6 UNIX. AT&T dc survives in systems that descend from System V, including [[Solaris]].		The original ''dc'' interpreter appeared in Version 1 (V1) AT&T UNIX. Therefore, ''dc'' precedes the [[:Category:C\|C language]] (appeared in V3 UNIX) and the [[Bourne Shell]] (appeared in V7 UNIX). The authors programmed the interpreter in [[:Category:PDP-11 Assembly\|PDP-11 Assembly]], and later rewrote it in C language. AT&T dc became the back end of [[AT&T bc]] in V6 UNIX. AT&T dc survives in systems that descend from System V, including [[Solaris]].