probing the graphic card in linux

sudo lshw -C display

.htaccess redirect

To redirect from abc.com to blog.abc.com, create a .htaccess  at the root directory of abc.com with the following line in it :

Redirect /index.html http://blog.abc.com

Finding the rpm package a that provides a certain file

In CentOS : yum whatprovides */pg_config

Changing system locale in R for locale dependent time string readings

lct <- Sys.getlocale("LC_TIME")
lct
[1] "French_Canada.1252"
strptime(" 27 Jun 2011 19:57:18","%d %b %Y %H:%M:%S") #Does not work
[1] NA
Sys.setlocale("LC_TIME", "C") #Change the locale to C
[1] "C"
strptime(" 27 Jun 2011 19:57:18","%d %b %Y %H:%M:%S") #Now it works
[1] "2011-06-27 19:57:18"
Sys.setlocale("LC_TIME", lct)
[1] "French_Canada.1252"

Debugging R : Catching warnings

withCallingHandlers(HL<-IDP_Read_Hydrolight512_Mfile(infile), warning=function(c) recover())

Accessing the contents of the special argument "..." in R

names(match.call())

also try ..1, ..2 etc

also try
dots <-match .call=".call" expand.dots="F)$...<!-----">

Multiple Y-axis in a R plot

Good and simple tutorial : http://www.r-bloggers.com/multiple-y-axis-in-a-r-plot/