Difference between revisions of "Rc"

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==Introduction==
 
==Introduction==
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[https://www.freebsd.org/cgi/man.cgi?query=rc&apropos=0&sektion=0&manpath=FreeBSD+12.1-RELEASE+and+Ports&arch=default&format=html '''rc''']  is a command interpreter and programming language similar to [https://www.freebsd.org/cgi/man.cgi?query=sh&sektion=1&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports '''sh(1)''']. It is based on the AT&T Plan 9 shell of the same name.  The  shell  offers  a C-like syntax (much more so than the Cshell) and a powerful mechanism for manipulating variables.  It is reasonably small and  reasonably fast, especially when compared to contemporary shells.  Its use is intended to be interactive, but the language lends  itself  well  to scripts.
  
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==SYNOPSIS==
  
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Syntax: rc [Option] [-c command] [arguments]
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There are options with this letters: [-deiIlnopsvx]
  
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If  -c  is  present,  commands are executed from the immediately  following argument.  Any further arguments to rc are  placed  in $*.  Thus:
  
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<code> rc -c 'echo $*' 1 2 3</code><br/>
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prints out:  1 2 3
  
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==COMMANDS==
  
 +
A  simple  command  is  a  sequence  of words, separated by white space (space and tab) characters that ends with a newline, semicolon (;),  or  ampersand  (&). The  first word of a command is the name of that command.  If the name begins with /, ./, or ../, then the name is used  as an  absolute path name referring to an executable file. Otherwise, the name of the command is looked up in a table of shell functions, builtin  commands, or as a file in the directories named by $path.
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 +
==More Tasks==
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 +
There are Task like:<br/>
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* [https://www.freebsd.org/cgi/man.cgi?query=sh&sektion=1&apropos=0&manpath=FreeBSD+12.1-RELEASE+and+Ports#COMMANDS COMMANDS]
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** Background Tasks
 +
** Subshells
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** Line continuation
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** Quoting
 +
** Grouping
 +
** Input and output
 +
** Pipes
 +
** Commands as Arguments
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* CONTROL STRUCTURES
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** If-Else Statements
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** While and For Loops
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** Switch
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** Logical Operators
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* PATTERN MATCHING
 +
** LISTS AND VARIABLES
 +
** List Concatenation
 +
** Free Carets
 +
** Variables
 +
** Local Variables
 +
** Variable Subscripts
 +
** Flat Lists
 +
** Backquote Substitution
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* SPECIAL VARIABLES
 +
* FUNCTIONS
 +
* INTERRUPTS AND SIGNALS
 +
* BUILTIN COMMANDS
 +
** . [-i]
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** break
 +
** builtin
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** cd
 +
** echo
 +
** eval
 +
** exec
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** exit
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** limit
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** newpgrp
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** return
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** shift
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** umask
 +
** wait
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** whatis
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* EXAMPLES
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* EXIT STATUS
 +
* GRAMMAR
 +
* FILES
 +
* CREDITS
 +
* BUGS
 +
* INCOMPATIBILITIES
 +
* SEE ALSO
  
  
 
[[Category:Sysutils]]
 
[[Category:Sysutils]]

Revision as of 17:16, 17 March 2020

Welcome to Icon Disti GhostBSD.png Rc.
OpenRC
Scripts
/etc/rc
rc - shell 		/etc/rc.devd
The generic hook into OpenRC. 		/sbin/rcorder
Ordering rc-scripts
/etc/init.d
Scripts to run OpenRC 		/usr/local/etc/init.d
Scripts to run OpenRC
/etc/rc.d
Scripts automatically executed at boot and shutdown 		/usr/local/etc/rc.d
Special scripts
Configuration
/etc/devd.conf
Configuration file for devd(8) 		/etc/conf.d
Initscript Configuration Files 		/etc/rc.conf.d
Smaller configuration files
/etc/defaults/rc.conf
Specifies the default settings for all the available options. 		/etc/rc.conf
The global OpenRC configuration file 		/etc/rc.conf.ghostbsd
GhostBSD specific configurations
Tools/Helper
/usr/sbin/sysrc
Safely edit system rc files 		/bin/rc-status
Shows which services are running 		/sbin/rc-update
Add or delete services
/sbin/rc-service
Locate and run an OpenRC service
Back to the Icon Disti GhostBSD.pngSystem

Introduction

rc is a command interpreter and programming language similar to sh(1). It is based on the AT&T Plan 9 shell of the same name. The shell offers a C-like syntax (much more so than the Cshell) and a powerful mechanism for manipulating variables. It is reasonably small and reasonably fast, especially when compared to contemporary shells. Its use is intended to be interactive, but the language lends itself well to scripts.

SYNOPSIS

Syntax: rc [Option] [-c command] [arguments]

There are options with this letters: [-deiIlnopsvx]

If -c is present, commands are executed from the immediately following argument. Any further arguments to rc are placed in $*. Thus:

rc -c 'echo $*' 1 2 3
prints out: 1 2 3

COMMANDS

A simple command is a sequence of words, separated by white space (space and tab) characters that ends with a newline, semicolon (;), or ampersand (&). The first word of a command is the name of that command. If the name begins with /, ./, or ../, then the name is used as an absolute path name referring to an executable file. Otherwise, the name of the command is looked up in a table of shell functions, builtin commands, or as a file in the directories named by $path.

More Tasks

There are Task like:

  • COMMANDS
    • Background Tasks
    • Subshells
    • Line continuation
    • Quoting
    • Grouping
    • Input and output
    • Pipes
    • Commands as Arguments
  • CONTROL STRUCTURES
    • If-Else Statements
    • While and For Loops
    • Switch
    • Logical Operators
  • PATTERN MATCHING
    • LISTS AND VARIABLES
    • List Concatenation
    • Free Carets
    • Variables
    • Local Variables
    • Variable Subscripts
    • Flat Lists
    • Backquote Substitution
  • SPECIAL VARIABLES
  • FUNCTIONS
  • INTERRUPTS AND SIGNALS
  • BUILTIN COMMANDS
    • . [-i]
    • break
    • builtin
    • cd
    • echo
    • eval
    • exec
    • exit
    • limit
    • newpgrp
    • return
    • shift
    • umask
    • wait
    • whatis
  • EXAMPLES
  • EXIT STATUS
  • GRAMMAR
  • FILES
  • CREDITS
  • BUGS
  • INCOMPATIBILITIES
  • SEE ALSO
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