Rc: Difference between revisions
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{{implementation|UNIX Shell}}[[wp:Rc|'''rc''']] is a simple yet powerful shell written by Tom Duff. Originally used on AT&T's Version 10 UNIX, it is now primarily used under [http://en.wikipedia.org/wiki/Plan_9_from_Bell_Labs Plan 9], where it is the default shell. Despite rc's simplicity, it is powerful enough that many of Plan 9's basic utilities are written using it.
==Examples==
Here is a script to check the weather in a given city. (Retrieved from [http://plan9.bell-labs.com/sources/plan9/rc/bin/weather http://plan9.bell-labs.com/sources/plan9/rc/bin/weather])
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Latest revision as of 17:37, 30 August 2009
rc is a simple yet powerful shell written by Tom Duff. Originally used on AT&T's Version 10 UNIX, it is now primarily used under Plan 9, where it is the default shell. Despite rc's simplicity, it is powerful enough that many of Plan 9's basic utilities are written using it.
Examples
Here is a script to check the weather in a given city. (Retrieved from http://plan9.bell-labs.com/sources/plan9/rc/bin/weather)
<lang rc>#!/bin/rc rfork e DEFAULT=ewr fn usage{ echo 'usage: weather 3-letter-city-code' >[1=2] echo 'for a list of cities in new york, say' >[1=2] echo ' weather ny' >[1=2] exit usage } switch($#*){ case 0 arg=$DEFAULT if(~ $#weather 1) arg=$weather case 1 arg=$1 case * usage } switch($arg){ case [a-zA-Z][a-zA-Z][a-zA-Z] script=( 'C' '4' '1' '1' $arg 'X') case [a-zA-Z][a-zA-Z] script=( 'C' '4' '1' '3' $arg 'X') case * usage } { for(i in $script) echo $i } | con -nrl tcp!rainmaker.wunderground.com!telnet | sed -n '/Enter .-letter .* code:/,/CITY FORECAST MENU/p' | sed 's/Enter .-letter .* code: //' | sed 's/ Press Return to continue, M to return to menu, X to exit: //' | grep -v 'CITY FORECAST MENU' | tr -d ' ' | sed 's/ *$//' | uniq</lang>