By "change port in Linux", I assume you mean changing the default port an application listens or transmits on. This is usually set in the program's settings or configuration file.
The FTP port has been standardized at port 21, so it is highly unlikely it is operating on another port. To change the port, you would have had to change configuration settings. And if you had, you would know what port it was on.
By default it listens on SMTP port 25
SMTP is normally run on port 25, regardless of what operating system is running the service.
The serial ports are named ttyS0, ttyS1, etc
Yes. There is a Linux port of Virtualbox and it runs Windows as well as any version of VB.
netstat - input will give a list of all ports in use on a machine with the service running on that port.
You don't run macOS applications on Linux unless there's a Linux port. As far as Windows goes, there is Wine. Do note that it's not an emulator and it won't run perfectly with everything.
Cygwin is used to port applications that were written for Unix or Linux to a Windows environment.
Use the "change port" command (without the quotes, of course) to change the port you're deciding to map to somewhere else. First, to display the current com port mappings, you can use change port / query Then, to change a port, type change [old com port]=[new com port] NOTE: Change the text in the brackets to the actual com port, making sure to use keyword "COM," again without the quotes, and in the example, without the brackets Here's an example: change port COM2=COM4 Finally, to delete a COM port listing, use the following format: change port /d [COM PORT] Here's an example of deleting a COM port listing: change port /d COM8 Hope this helps!
chmod +x is the command to set the executable flag in Linux but, Linux does not use exe files.
You change the current working path directory in Linux by issuing the cd command, followed by the directory you want to change to. For example:cd /dev/inputwould take me to the that directory.
The jobs ones could have that involve Linux are as diverse as the uses of Linux itself. If you are a computer programmer, you could write drivers for new devices (Linux is very popular in the embedded filed), port commercial games to Linux (like id Software does), or program a database that runs on Linux. If you are more interested in maintenance, you could become the administrator of a web server.