Runs unix or dos depending on the current operating system. For
R, just runs system with optional concatenation of first two
arguments which are assumed named command and text.
sys(command, text=NULL, output=TRUE)
# S-Plus: sys(\dots, minimized=FALSE)see unix or dos
system command to execute
text to concatenate to system command, if any (typically options or file names or both)
set to FALSE to not return output of command as a character
vector
executes system commands