import os
if os.name == "nt" or os.name == "dos":
fileList = "dir /B"
sortReverse = "sort /R"
elif os.name == "posix": # UNIX-compatible system
fileList = "ls -1"
sortReverse = "sort -r"
else:
sys.exit( "OS not supported by this program." )
dirOut = os.popen( fileList, "r" )
sortIn, sortOut = os.popen2( sortReverse )
filenames = dirOut.read()
print "(Output from '%s'):" % fileList
print filenames
sortIn.write( filenames )
dirOut.close()
sortIn.close()
print "(Output from '%s'):" % sortReverse
print sortOut.read()
sortOut.close()