cd.RdDisplays or changes working directory, or lists files therein.
cd(dname)
pwd()
what(dname = getwd())pwd() displays the name of the current directory, and is the same
as cd(). cd(dname) changes to directory dname and if
successfull displays the directory name.
what() lists all files in a directory.
Name of the current working directory.
# cd()
# pwd()
# what()