Rony
provided a comprehensive overview of operating
system commands, focusing on their usage,
switches, arguments, and return codes. He
demonstrated how to use various commands in
Windows and Unix, including directory listing,
file copying, and sorting, and highlighted the
importance of using double quotes around file
names containing blanks. Rony also introduced the
concept of the Rex program, which can be used to
execute commands on both Windows and Unix systems,
and explained its functionality, process
management, and the significance of the PATH
variable. Lastly, he discussed the redirection of
standard files, including input, output, and
error, and demonstrated how to redirect standard
in, out, and error to different files.