The serial ports are named ttyS0, ttyS1, etc
The serial ports are named ttyS0, ttyS1, etc.And usually correspond respectively to COM1, COM2, etc. in DOS/Windows
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.
By default it listens on SMTP port 25
/dev/hdx - IDE hard drive. No longer commonly used. /dev/sdx - SCSI hard drive. Now also used to refer to IDE and Flash drives as well. /dev/ttyS0 - serial port, equivalent of COM1 in Windows / DOS /dev/dvd - block device for reading a disc drive with a DVD file system /dev/js0 - joystick
SMTP is normally run on port 25, regardless of what operating system is running the service.
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.
Yes. There is a Linux port of Virtualbox and it runs Windows as well as any version of VB.
Port 80
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.
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.