Rc: Difference between revisions
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(New page: 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]...) |
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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. |
{{implementation|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 [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. |
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==Examples== |
==Examples== |
Revision as of 18:42, 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