Berkeley Software Distribution. A UNIX operating system developed by Berkeley, the University of California.
A command which does not have its own executable but is part of the shell itself.
A popular and influential GNU/Linux distribution
"GNU's Not Unix". A project to develop an open source operating system. Includes many of the utilities which run on top of the Linux kernel.
A Unix-like computer operating systems using the Linux kernel.
Process ID. Unique identifier given to a running program.
A piece of software that provides a command line interface for users of an operating system.
A Unix operating system developed by Sun Microsystems.
Standard error. An output stream typically used by programs to output error messages or diagnostics. Uses file descriptor 2.
Standard input. The default input stream into a Unix program. Uses file descriptor 0.
Standard output. The default output stream from a Unix program. Uses file descriptor 1.
A popular GNU/Linux distribution originally based on Debian.
An operating system originally developed in 1969 by a group of AT&T employees at Bell Labs.