R：directory相关命令
Jan 25, 2008R.home(base) Return the R Home Directory basename(base) Manipulate File Paths files(base) File and Directory Manipulation
getwd(base) Get Working Directory setwd(base) Set Working Directorylist.files(base) List the Files in a Directory/Folder tempfile(base) Create Names for Temporary Files unlink(base) Delete Files and Directories substituteDirect(methods) SubstituteDirect TkCommands(tcltk) Tk non-widget commands tcltk-defunct(tcltk) Defunct Functions in Package tcltk RHOME(utils) R Home Directory