file descriptor
A non-negative integer a process uses to refer to an open file, pipe, or socket. By convention, 0, 1, and 2 are the standard streams; a process's open descriptors are listed in /proc/
A non-negative integer a process uses to refer to an open file, pipe, or socket. By convention, 0, 1, and 2 are the standard streams; a process's open descriptors are listed in /proc/