April 2018
Intermediate to advanced
176 pages
4h 16m
English
As we have explained earlier, We created a shell by creating a subprocess and passing the commands to this subprocess. Now, the point is that some commands cannot work properly using this technique, such as the cls and clear commands, both of which will not work in a shell. Now, for instance, let's say that we were able to get a shell to the client PC and later on we discovered some kind of Telnet or FTP server connected on the same internal network. Unfortunately, we cannot use the built-in Telnet client in the operating system from our shell and this is because once we do so, the server will prompt us with a username and password; this is called the interactive method and the shell will fail to handle ...