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netcat (often abbreviated to nc) is a computer networking utility for reading from and writing to network connections using TCP or UDP.The command is designed to be a dependable back-end that can be used directly or easily driven by other programs and scripts.
The port numbers in the range from 0 to 1023 (0 to 2 10 − 1) are the well-known ports or system ports. [3] They are used by system processes that provide widely used types of network services. On Unix-like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the ...
For TCP, port number 0 is reserved and cannot be used, while for UDP, the source port is optional and a value of zero means no port. A process associates its input or output channels via an internet socket , which is a type of file descriptor , associated with a transport protocol , a network address such as an IP address , and a port number.
Services, such as web pages or FTP, require their respective ports to be "open" on the server in order to be publicly reachable. The above use of the terms "open" and "closed" can sometimes be misleading, though; it blurs the distinction between a given port being reachable (unfiltered) and whether there is an application actually listening on ...
PrBoom is a Doom source port derived from Linux and Windows ports of Boom and MBF that includes an optional OpenGL renderer, as well as options allowing it to restore the behavior of earlier executables (such as Doom version 1.9, Boom, and MBF) in essential ways. A variation named PrBoom+ provides enhanced demo recording and viewing capabilities.
When activating a port, the files in the destroot directory are moved to their correct location. This makes them accessible to the user, completing the installation process. [58] If they wish to try a different version of the port, they can deactivate their current version and activate the new one.
The line-oriented debugger DEBUG.EXE is an external command in operating systems such as DOS, OS/2 and Windows (only in 16-bit/32-bit versions [1]).. DEBUG can act as an assembler, disassembler, or hex dump program allowing users to interactively examine memory contents (in assembly language, hexadecimal or ASCII), make changes, and selectively execute COM, EXE and other file types.
The port authority's primary responsibilities are the operation of the Oakland Seaport and the Oakland International Airport. It also operates a commercial real estate business as the owner of Jack London Square, Airport Business Park, and more than 875 acres (354 ha) of waterfront property. It operates a municipal electric utility that serves ...