WHEN YOU NEED 

Executing commands from or diverting output to a file

If commands  are stored in an external file, say commands.R in the working directory work, they may be executed at any time in an R session with the command

> source("commands.R")

For Windows Source is also available on the File menu. The function "sink",

> sink("record.lis")

will divert all subsequent output from the console to an external file, record.lis. The command

> sink()

NOTE : when you collect data from the outside you can use this function for made easy with your                     data  to use.