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本篇内容主要讲解“linux rc 的含义是什么”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让丸趣 TV 小编来带大家学习“linux rc 的含义是什么”吧!
linux rc 是 runcom 的缩写，也是“.cshrc”或“/etc/rc”中出现的 rc；rc 来源于 runcom，首次出现于 1965 年的 MIT CTSS 系统；在某些场景中，会执行被存储在文件中的多条命令 commands，我们称之为 runcom，即运行命令 run commands 的简称。
Linux rc 含义全称
这要从 Unix 系统的史前时代 (1961-1969) 开始讲起，在一开始由 MIT 为主力开发过一个兼容分时系统(Compatible Time-Sharing System)，简称 CTSS。
（这个 CTSS 他功能虽然比不了后来的 Unix 系统，但是人家辈分大，年代早。）
CTSS 系统中有一个关于命令脚本的特性叫做 runcom。
为了致敬这个古早版本 Unix 系统——CTSS 的 runcom 特性，后来的 Unix 系统中就用 rc 作为操作系统的启动文件名。
Tips
程序语言里的 Date 是从 1970-01-01 开始的，
而前面提到的 Unix 的史前时代 (1961-1969) 还在 1970 年之前。
也可以侧面感受到 CTSS 这个系统的“辈分”之大。
含义
rc = RunCom
“rc”是取自“runcom”, 来自麻省理工学院在 1965 年发展的 CTSS 系统。相关文献曾记载这一段话：“具有从档案中取出一系列命令来执行的功能；这称为 run commands 又称为“runcom”，而这种档案又称为一个 runcom (a runcom)。”
实例
.bashrc bash 的运行命令
.vimrc vim 的运行命令
.npmrc npm 的运行命令
Linux 中，文件名以. 开头表示为隐藏文件。
leung@wuyujin ~ % ls -al | grep rc$
-rw------- 1 leung staff 33 5 13 20:34 .npmrc
-rw-r--r-- 1 leung staff 116 5 13 21:20 .yarnrc
-rw-r--r-- 1 leung staff 55 6 2 20:00 .zshrc
参考 What does rc mean in bashr, zshrc, vimrc etc?
What does rc mean in bashr, zshrc, vimrc etc?
翻译如下：
对于 rc 所代表的意思，你可能会看到以下几种：
run commands(运行命令)
resource control(资源控制)
run control(运行控制)
runtime configuration(运行时配置)
在读过这份文档之后，我更愿意认为 rc 是 runcom 的缩写。
rc = RunCom 就是.cshrc 或 /etc/rc 中出现的那个 rc
rc 来源于 runcom，首次出现于 1965 年的 MIT CTSS 系统。
在某些场景中，(我们)会执行被存储在文件中的多条命令 commands，我们称之为 runcom 即运行命令 run commands 的简称。
另外，这个用于存储命令的文件被称作：a runcom。
Unix 文件命名中的 rc 就是来自于这样的老典故。
— Brian Kernighan Dennis Ritchie, as told to Vicki Brown
Also ESR states that in Run-Control Files:
当然，你也可以在 Run-Control 文件中找到证据：
rc 后缀一直往前追溯，会发现其实它在 Unix 的爷爷辈老系统——CTSS 里就有了。
而在 CTSS 这个古早的系统中有一个命令脚本的特性叫做：runcom。
于是早期 Unix 就开始使用 rc 作为操作系统启动脚本的文件名，以此来追忆 / 致敬 CTSS runcom。
所以我认为：rc 是 runcom 的缩写。
CTSS(Compatible Time-Sharing System)兼容分时系统
Unix 系统的背景
1961-1969：史前时代
CTSS(Compatible Time-Sharing System，兼容分时系统)，以 MIT 为首的开发小组，小而简单的实验室原型。
Multics(Multiplexed Information and Computing System，多路信息与计算系统)，庞大而负责，不堪重负。
Unics(Uniplexed information and Computing System，单路信息与计算系统)，返璞归真，走上正道。
1969-1971：创世纪
……
参考 Unix – Frequently Asked Questions (1/7) [Frequent posting]Section – What does {some strange unix command name} stand for
1.3) What does {some strange unix command name} stand for?
awk = Aho Weinberger and Kernighan
This language was named by its authors, Al Aho, Peter
Weinberger and Brian Kernighan.
grep = Global Regular Expression Print
grep comes from the ed command to print all lines matching a
certain pattern
g/re/p
where re is a regular expression .
fgrep = Fixed GREP .
fgrep searches for fixed strings only. The f does not stand
for fast - in fact, fgrep foobar *.c is usually slower than
egrep foobar *.c (Yes, this is kind of surprising. Try it.)
Fgrep still has its uses though, and may be useful when searching
a file for a larger number of strings than egrep can handle.
egrep = Extended GREP
egrep uses fancier regular expressions than grep. Many people
use egrep all the time, since it has some more sophisticated
internal algorithms than grep or fgrep, and is usually the
fastest of the three programs.
cat = CATenate
catenate is an obscure word meaning to connect in a series ,
which is what the cat command does to one or more files. Not
to be confused with C/A/T, the Computer Aided Typesetter.
gecos = General Electric Comprehensive Operating Supervisor
When GE s large systems division was sold to Honeywell,
Honeywell dropped the E from GECOS .
Unix s password file has a pw_gecos field. The name is a
real holdover from the early days. Dennis Ritchie has reported:
Sometimes we sent printer output or batch jobs
to the GCOS machine. The gcos field in the password file
was a place to stash the information for the $IDENT card.
Not elegant.
nroff = New ROFF
troff = Typesetter new ROFF
These are descendants of roff , which was a re-implementation
of the Multics runoff program (a program that you d use to
run off a good copy of a document).
tee = T
From plumbing terminology for a T-shaped pipe splitter.
bss = Block Started by Symbol
Dennis Ritchie says:
Actually the acronym (in the sense we took it up; it may
have other credible etymologies) is Block Started by
Symbol. It was a pseudo-op in FAP (Fortran Assembly [-er?]
Program), an assembler for the IBM 704-709-7090-7094
machines. It defined its label and set aside space for a
given number of words. There was another pseudo-op, BES,
Block Ended by Symbol that did the same except that the
label was defined by the last assigned word + 1. (On these
machines Fortran arrays were stored backwards in storage
and were 1-origin.)
The usage is reasonably appropriate, because just as with
standard Unix loaders, the space assigned didn t have to be
punched literally into the object deck but was represented
by a count somewhere.
biff = BIFF
This command, which turns on asynchronous mail notification,
was actually named after a dog at Berkeley.
I can confirm the origin of biff, if you re interested.
Biff was Heidi Stettner s dog, back when Heidi (and I, and
Bill Joy) were all grad students at U.C. Berkeley and the
early versions of BSD were being developed. Biff was
popular among the residents of Evans Hall, and was known
for barking at the mailman, hence the name of the command.
Confirmation courtesy of Eric Cooper, Carnegie Mellon University
rc (as in .cshrc or /etc/rc) = RunCom
rc derives from runcom , from the MIT CTSS system, ca. 1965.
There was a facility that would execute a bunch of
commands stored in a file; it was called runcom for run
commands , and the file began to be called a runcom.
rc in Unix is a fossil from that usage.
Brian Kernighan Dennis Ritchie, as told to Vicki Brown
rc is also the name of the shell from the new Plan 9
operating system.
Perl = Practical Extraction and Report Language
Perl = Pathologically Eclectic Rubbish Lister
The Perl language is Larry Wall s highly popular
freely-available completely portable text, process, and file
manipulation tool that bridges the gap between shell and C
programming (or between doing it on the command line and
pulling your hair out). For further information, see the
Usenet newsgroup comp.lang.perl.misc.
Don Libes book Life with Unix contains lots more of these
tidbits.到此，相信大家对“linux rc 的含义是什么”有了更深的了解，不妨来实际操作一番吧！这里是丸趣 TV 网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
