R version 2.13.0 (2011-04-13)
Copyright (C) 2011 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: i486-pc-linux-gnu (32-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> x <- c('Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'Firefox'
+ ,'MSIE'
+ ,'Chrome'
+ ,'Firefox'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'Firefox'
+ ,'Firefox'
+ ,'MSIE'
+ ,'Firefox'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'Firefox'
+ ,'Safari'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'Opera'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'Firefox'
+ ,'Safari'
+ ,'Firefox'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'Safari'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'Chrome'
+ ,'MSIE'
+ ,'Firefox'
+ ,'Safari'
+ ,'Safari'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'Firefox'
+ ,'Safari'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Safari'
+ ,'Firefox'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Safari'
+ ,'MSIE'
+ ,'Firefox'
+ ,'Firefox'
+ ,'MSIE'
+ ,'Safari'
+ ,'Safari'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Chrome'
+ ,'MSIE'
+ ,'Firefox'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'Firefox'
+ ,'Safari'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE'
+ ,'MSIE')
> par4 = 'Unknown'
> par3 = 'FALSE'
> par2 = 'grey'
> par1 = ''
> xlab = 'Browser'
> main = 'Frequency plot 'Operating systems''
Error: unexpected symbol in "main = 'Frequency plot 'Operating"
Execution halted