Rc: Difference between revisions

{{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.

<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=(<nowiki>'' '' 'C' '4' '1' '1' $arg '' '' '' '' 'X'</nowiki>)

case [a-zA-Z][a-zA-Z]

script=(<nowiki>'' '' 'C' '4' '1' '3' $arg '' '' '' '' 'X'</nowiki>)

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>