Difference between revisions of "Rc"

Latest revision as of 05:38, 13 April 2020

Welcome to 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 System

Introduction[edit]

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.
rc is the base of all scripts and files related to OpenRC.

SYNOPSIS[edit]

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[edit]

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[edit]

There are Task like:

• COMMANDS
  • Background Tasks
  • Subshells
  • Line continuation
  • Quoting 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