Rc: Difference between revisions
Content added Content deleted
(UNIX Shell implementation) |
m (Fixed wiki formatting) |
||
Line 25: | Line 25: | ||
switch($arg){ |
switch($arg){ |
||
case [a-zA-Z][a-zA-Z][a-zA-Z] |
case [a-zA-Z][a-zA-Z][a-zA-Z] |
||
script=('' '' 'C' '4' '1' '1' $arg '' '' '' '' 'X') |
script=(<nowiki>'' '' 'C' '4' '1' '1' $arg '' '' '' '' 'X'</nowiki>) |
||
case [a-zA-Z][a-zA-Z] |
case [a-zA-Z][a-zA-Z] |
||
script=('' '' 'C' '4' '1' '3' $arg '' '' '' '' 'X') |
script=(<nowiki>'' '' 'C' '4' '1' '3' $arg '' '' '' '' 'X'</nowiki>) |
||
case * |
case * |
||
usage |
usage |
Revision as of 19:28, 24 January 2008
Rc is an implementation of UNIX Shell.
Other implementations of UNIX Shell.
rc is a simple yet powerful shell written by Tom Duff. Originally used on AT&T's Version 10 UNIX, it is now primarily used under Plan 9, where it is the default shell. Despite rc's simplicity, it is powerful enough that many of Plan 9's basic utilities are written using it.
Examples
Here is a script to check the weather in a given city. (Retrieved from http://plan9.bell-labs.com/sources/plan9/rc/bin/weather)
#!/bin/rc rfork e DEFAULT=ewr fn usage{ echo 'usage: weather 3-letter-city-code' >[1=2] echo 'for a list of cities in new york, say' >[1=2] echo ' weather ny' >[1=2] exit usage } switch($#*){ 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